Grammar · Lesson 14

Advice and obligation with should, must, and have to

Decide whether an action is recommended, required, prohibited, or optional. Then choose the form and register that fit: You should label the boxes. Staff have to arrive by 8:30. Visitors must wear badges. You don’t have to print a ticket.

50–60 min corerecommendation · requirement · prohibition · choiceshould · must · have to15–20 min listening and retrieval

NoticeCompare a suggestion, schedule, official notice, and optional task.

DiscoverChoose the meaning first, then notice overlap and register.

BuildControl modal form, have-to form, negatives, and time.

UseBrief a fictional event team and answer rule questions.

Can-do: By the end, you can recommend an action, state an ordinary or firm requirement, prohibit an action, show that an action is optional, ask about a rule, and move an obligation into past or future time.

Two-minute retrieval

Three checks from earlier lessons

Use the form clue and the stated purpose in each sentence.

1The modal takes a base verb after every subject: Marco translate the welcome message.

2The singular subject Rina takes third-person present have: Rina the event key.

3Give one direct instruction to stop the outside noise: the side door, please.

Notice four messages for one fictional event

Westbridge Community Center open house

Teammate’s suggestion: You should label the boxes by room. It will make setup easier.

Coordinator’s schedule email: Staff have to arrive by 8:30 because setup begins at 8:45.

Official entrance notice: All visitors must wear an event badge.

Task list: Volunteers don’t have to stay after 4:00. The late team can finish cleanup.

Restricted-room notice: Visitors must not enter the equipment room.

Which action is recommended but not required?
Which two actions are required, and why might one notice sound firmer or more official?
Which action is optional? Which action is prohibited?

Discovery check: identify meaning and framing

1The teammate presents labeling as a useful idea, not a rule: You should label the boxes gives a .

2The schedule makes 8:30 necessary in a neutral email: Staff have to arrive by 8:30 states an .

3The entrance sign presents badge use as official and firm: Visitors must wear badges states a .

4The restricted-room notice says visitors cannot enter: the action is .

5The late team can handle cleanup, so staying after 4:00 is .

6We have to lock the doors at 6:00 in conversation and Staff must lock all doors at 6:00 on a notice can express .

Get to the root: choose the meaning before the form

Do not treat these forms as three fixed steps on one strength ladder. First decide the status of the action. Is it recommended, required, prohibited, or optional? If it is required, choose how the speaker wants to frame that requirement.

intended meaning	useful A2 choice	example
recommendation	should	You should label the boxes.
advice against an action	shouldn’t	You shouldn’t block the exit.
ordinary requirement in conversation	have to	We have to finish by six.
firm instruction or formal requirement	must	Visitors must wear badges.
prohibition	must not / mustn’t	Visitors must not enter.
no necessity; the person has a choice	don’t / doesn’t have to	You don’t have to print a ticket.

Must and have to overlap. Either can describe a real obligation. In everyday U.S. conversation, have to is common for ordinary requirements. Must often sounds firmer, more formal, or more emphatic, so it is common in notices and careful instructions. Context and register matter more than a memorized “inside versus outside authority” rule.

This lesson uses should for recommendations. Should has other meanings, including expectation, but those belong to a later lesson.

Build two form systems

Should and must are modal verbs. They keep one form for every subject and take a base verb without to. Have to uses ordinary present and past grammar.

purpose	should / must	have to
positive	She should call. He must sign.	I have to leave. She has to leave.
negative	She shouldn’t wait. He must not enter.	I don’t have to leave. She doesn’t have to leave.
question	Should I call?	Do I have to leave? Does she have to leave?
short answer	Yes, you should. No, you shouldn’t.	Yes, you do. No, she doesn’t.

Say She should call, not she shoulds call, she should to call, or does she should call. Say Does she have to call?, not does she has to call?. The word does already carries present-tense agreement, so the main verb returns to have.

Drill 1: complete the form system

1The modal takes the base verb without to: You should the coordinator.

2The modal does not add third-person s: Every visitor wear a badge.

3The singular subject Maya takes third-person has to: Maya to arrive by 8:30.

4Ask several volunteers about the rule: the volunteers have to stay after 4:00?

5The badge is optional for the singular subject Lee: Lee have to wear a staff badge.

6Ask the coordinator for a recommendation, not a rule: I label the boxes now?

Keep recommendation, prohibition, and choice apart

Three negatives, three different consequences

You shouldn’t use the narrow hallway. The speaker recommends another route.

You must not use the emergency exit. A rule prohibits that route.

You don’t have to use the main entrance. The main entrance is optional; another entrance is available.

Must not and its contraction mustn’t mean “do not do it.” Don’t have to means “it is not necessary,” so the action remains possible. Shouldn’t normally gives advice against an action in this lesson; it does not automatically create a rule.

Drill 2: choose the intended meaning and register

1A teammate offers a useful idea, not a requirement: You put the map beside the entrance.

2A teammate advises against blocking the view, but no rule forbids it: You put the tall sign in front of the map.

3In an ordinary team update, the event schedule requires everyone to finish by six: We finish cleanup by six.

4An official entrance notice uses a firm formal voice: All visitors wear an event badge.

5A posted safety rule prohibits the action: Staff block the emergency exit.

6Digital tickets are accepted, so printing is optional: You print your ticket.

Move requirements through time with have to

Must can point to the present or future when context supplies the time: You must sign now. You must submit the form tomorrow. However, English normally uses the have to family when an obligation needs ordinary past, future, or other verb forms.

time	required	not required
present	Maya has to arrive early.	Maya doesn’t have to stay late.
finished past	Maya had to arrive early yesterday.	Maya didn’t have to stay late.
future	Maya will have to arrive early tomorrow.	Maya won’t have to stay late.

Do not say musted or will must. Use had to for a finished past requirement and will have to for a future requirement. Didn’t have to says an action was unnecessary; by itself, it does not tell us whether the person did the action anyway.

Drill 3: let the time frame choose the have-to form

1The schedule requires the singular coordinator to open the center every Saturday: The coordinator open the center every Saturday.

2Yesterday’s power inspection created a finished past requirement: We move the information table yesterday.

3Ask whether the finished inspection required Lee to wait: Lee have to wait for the inspector?

4A new city rule begins next month, so the future requirement is not active yet: Events provide two recycling stations next month.

5The late team is scheduled next Saturday, so Maya’s early team will have no cleanup requirement: Maya stay for cleanup next Saturday.

Ask for advice or ask about a rule

information you want	natural question	answer
a recommendation	Should I move this table?	Yes, you should. It blocks the map.
an ordinary requirement	Do I have to move this table?	No, you don’t. That is only a suggestion.
a past requirement	Did Lee have to move it?	Yes, he did. The inspector needed the space.

Must I...? is grammatical, but it sounds formal and is uncommon in ordinary U.S. conversation. People usually ask Do I have to...? about a rule. In everyday U.S. speech, can’t and not allowed to are also common ways to express prohibition: Visitors can’t enter. Visitors aren’t allowed to enter. Formal notices often use must not.

Sound natural: reduce the frame and stress the action

In neutral speech, the important action usually carries the strongest beat. Friendly should is often weak /ʃəd/: You should MOVE it. The connected forms have to and has to commonly sound like /ˈhæftə/ and /ˈhæstə/: We have to LEAVE. She has to START.

Strong stress can change the stance, not the grammar. You SHOULD move it sounds corrective or more insistent. You MUST leave now foregrounds firm necessity. In must not, keep the negative meaning clear. The contraction mustn’t is possible, but full must not is common in formal U.S. notices.

Listen: what is the action’s status?

Your teacher reads each fictional event message once naturally and once more slowly. Decide whether the action is recommended, required, prohibited, or optional, and listen for its time. Check your answer before discussing the line with your tutor.

Tutor-read listening check

1. What does Clip 1 give?

2. Why do staff use the side door in Clip 2?

3. What is the status of entering the equipment room in Clip 3?

4. What is optional in Clip 4?

5. What time and meaning does had to express in Clip 5?

6. What kind of question is Clip 6?

Read the final event guide

Saturday open-house guide

Staff have to enter through the side door by 8:30. At the entrance, all visitors must show a ticket, but they don’t have to bring a printed copy because a phone screen is fine. Volunteers should send large groups to the east hall first; it usually has more space. Nobody must block the emergency exit. Yesterday, the setup team had to move one information table after the power inspection. Next month, events will have to add a second recycling station.

Reading check: use only the guide

1. What are staff required to do?

2. What choice do visitors have?

3. What does the guide recommend?

4. Why did the setup team move a table yesterday?

Build a recommendation and a rule question

Drill 4: build the recommendation

A teammate thinks the map would be easier to see in another place.

Drill 5: build the ordinary rule question

Ask whether the badge rule applies to you.

Notice and repair three different errors

Drill 6: modal plus base verb

The notice says: Visitors must to show a ticket. Tap the one word that must be removed.

Drill 7: question agreement

The coordinator asks: Does Maya has to arrive by 8:30? Tap the word with the wrong form.

Drill 8: prohibition or no necessity

The guide says: You mustn’t print the ticket because a phone screen is fine. Tap the phrase with the wrong meaning.

Oral transforms: change meaning or time

Say each complete sentence before revealing it. Keep the stated meaning exactly.

1 I should move the map. Change the subject to she.

She should move the map.

2 Maya has to arrive early. Ask an ordinary rule question.

Does Maya have to arrive early?

3 Printing is optional. Use don’t have to.

You don’t have to print the ticket.

4 Entering is prohibited. Use formal must not.

Visitors must not enter.

5 We have to move the table today. Change the time to yesterday.

We had to move the table yesterday.

6 A new rule begins next month. Use future have to.

Events will have to add a second recycling station next month.

Play and practice

Games and a short reading that recycle this lesson. Use them as a warm-up, a fast finisher, or homework. Each one checks itself.

Read

Your first week at Green Leaf Cafe

Read once for meaning. Then read again and do the tasks below.

Guide for new staff122 wordsAbout 1 min

Welcome to the team! Here are a few important points for your first week. All kitchen staff must wear a hair net. You must not use your phone in the kitchen, but you can check it on your break.

Morning staff have to arrive by 6:30 because we open at 7:00. You don’t have to bring lunch, because staff meals are free. On busy days, you should drink a lot of water, and you should ask for help when the line is long.

Last month, the manager had to close the kitchen for a day because of a broken freezer. Please tell Martin about any problem with the machines. You shouldn’t wait until the end of your shift. See you on Monday!

Find it

Tap the 8 base verbs that come right after should, must, or a form of have to (positive, negative, or past). Skip can.

Check your understanding

1. Why do morning staff have to arrive by 6:30?

2. Which action is optional for new staff?

3. What should staff do about a problem with a machine?

Sort it

What is the action’s status?

Decide the meaning first. Tap each sentence, then tap its box.

Match up

Sentence and meaning

Tap an item on the left, then its partner on the right.

Sentence

Meaning

Unscramble

Build rules, advice, and questions

Tap the words in order to build the sentence. Tap a placed word to send it back.

1. Ask about a rule for her.
2. Printing is optional.
3. A finished past requirement.
4. Ask for a recommendation.
5. A formal rule on a sign.

Communicate: brief the fictional event team

You never need to disclose your real work, school, home, location, schedule, travel, family, relationships, finances, health, legal status, rules, passwords, or future plans. Use Westbridge Community Center, invent a neutral public event, or share personal information only when you freely choose.

Ask before briefing: Ask the coordinator one advice question with Should I...? and two ordinary rule questions with Do I have to...?. Answer each with a reason.

Final production: give a 45–60 second fictional event-team briefing. Include one recommendation, two ordinary requirements, one formal firm requirement, one prohibition, one optional action, one finished past requirement, and one future requirement. Your partner identifies the status and time of each action, then asks one follow-up question.

Register switch: Say one requirement first as an ordinary spoken team update with have to, then rewrite the same requirement as a firm official notice with must. Explain what changed in presentation and what did not change in the underlying rule.

Final check

Five decisions with one defensible target

1. Which sentence presents moving the map only as a recommendation?

2. Which question naturally asks in ordinary U.S. conversation whether the badge rule applies to you?

3. The center accepts a phone screen. What does You don’t have to print the ticket mean?

4. Which sentence accurately reports yesterday’s inspection requirement?

5. A coordinator says We have to lock the doors at six. A posted notice says Staff must lock all doors at six. What is the best analysis?

Reflect and retrieve

Explain the decision path without looking back

How do you distinguish a recommendation, ordinary requirement, firm formal requirement, prohibition, and lack of necessity? Why can must and have to describe the same rule? What forms replace must for a finished past and an explicit future obligation?

Return tomorrow before rereading. Complete the five-minute next-day retrieval, then revisit only the meaning, form, time, negative, register, or spoken pattern that still feels slow.

Next-day retrieval

Choose from memory before looking back

1A teammate gives a useful idea, not a rule: You the map beside the entrance.

2A phone ticket is accepted, so a paper copy is optional: You the ticket.

3Yesterday’s inspection created a finished past requirement: Lee for the inspector yesterday.