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Learning Objectives

2 minutes reading
✓
Use 'must' and 'have to' to express obligation and necessity
✓
Use 'should' and 'ought to' to give advice and recommendations
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Distinguish between internal and external obligation
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Use negative forms correctly (mustn't vs don't have to)
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Tip for this lesson

Remember: must = personal/internal obligation, have to = external rules, should = advice (not obligation). The negative forms are very different!

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Grammar Explanation

4 minutes reading
MUST

Strong Obligation (Internal)

Subject + must + base verb

Use for: Personal obligation, strong necessity, rules you believe in

I must finish this You must try harder We must be careful
HAVE TO

Obligation (External Rules)

Subject + have to / has to + base verb

Use for: External rules, laws, requirements from others

I have to work late She has to wear a uniform We have to submit reports
SHOULD

Advice & Recommendations

Subject + should + base verb

Use for: Giving advice, making suggestions, saying what is right

You should rest We should check this They should apologize
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Key Method

Ask yourself: Is this a rule (have to), a personal belief (must), or just advice (should)? The source of the obligation matters!

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Context & Professional Usage

5 minutes reading

Obligation Contexts

📋 Rules: "You have to sign in"
⏰ Deadlines: "I must finish by Friday"
👔 Dress code: "We have to wear formal clothes"
📝 Reports: "She has to submit weekly updates"

Advice Contexts

💡 Suggestions: "You should try this method"
⚠️ Warnings: "You shouldn't ignore this"
🎯 Best practice: "We should double-check"
🤝 Professional: "You should speak to HR"
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Business English Examples

6 minutes reading
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Correct Professional Usage

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"I must call the client today." (personal decision)

Internal obligation - I believe it's important

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"We have to submit reports every Friday." (company rule)

External obligation - the company requires this

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"You should double-check those figures."

Advice - it's a good idea, but not required

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"You don't have to work overtime." (no obligation)

No obligation - it's your choice

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Common Business English Mistakes

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"You mustn't work tomorrow." (meaning: no obligation)

Mustn't = prohibited! Use: "You don't have to work." (no obligation)

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"She musts finish the report."

Use: "She must finish..." (no -s after modals)

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"I must to leave now."

Use: "I must leave now." (no 'to' after must)

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Professional Listening Exercise

6 minutes

Listen to Maria, a Project Manager, welcoming Leo, a new team member, and explaining the rules:

🎵 Audio: New Team Member Onboarding
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0:00 / 0:00
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Speed:

Maria: Hi Leo, welcome to the team! I'm Maria, the project manager. I want to talk about how we work on this project.

Leo: Hi Maria, great to be here. Thanks.

Maria: Of course. So, first, a few company things. You have to complete your online HR training by the end of the week. Everyone does this. Also, you have to submit your timesheet every Friday. That's a firm company rule.

Leo: Okay, HR training and timesheets. Got it.

Maria: Great. For our team specifically, there are two key things. You must attend our daily stand-up meeting at 9:15 AM. It's very important for communication. And you mustn't miss the weekly project review on Wednesdays. It's mandatory.

Leo: 9:15 AM stand-up, Wednesday review. No problem.

Maria: Perfect. Now, for some general advice. The work can be difficult sometimes. You should ask questions if you are not sure about something. Please, don't be shy. We are here to help.

Leo: That's good to know, thank you.

Maria: And you should take regular breaks. It's important not to get too tired. You don't have to work late every day. We want you to have a good work-life balance. If you finish your tasks, you can go home. You don't have to stay until 6 PM just because other people are here.

Leo: That sounds really good. Thanks, Maria. This is very helpful.

Maria: You're welcome, Leo. My final piece of advice is that you should have lunch with the team this week. It's a great way to get to know everyone.

Question 1: Why does Maria say, "You have to submit your timesheet every Friday"?

💡 Hint: Maria uses 'have to' because submitting a timesheet is a company rule, not her personal opinion.

Question 2: What is the main purpose of this conversation?

💡 Hint: Maria explains company policies ('have to'), team rules ('must'), and gives friendly advice ('should').

Question 3: Complete the sentence from the audio: "You ________ attend our daily stand-up meeting at 9:15 AM."

💡 Hint: Maria uses 'must' because she sees the meeting as a very important internal team rule.
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Quick Comprehension Quiz

4 minutes

Choose the correct option for each professional situation:

1

All employees _____ complete the safety training. (company rule)

A have to
B should
C might
2

You _____ share confidential information. It's prohibited.

A don't have to
B mustn't
C shouldn't
3

You look tired. You _____ take a break. (advice)

A must
B should
C have to
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Professional Practice Exercises

7 minutes

Exercise A: Choose must, have to, or should

1.

All visitors _______ wear a security badge. (company rule)

💡 Hint: For external rules, use "have to" or "must".
2.

You _______ try the new restaurant. It's excellent! (recommendation)

💡 Hint: For advice and recommendations, use "should".
3.

I _______ call my mother - I promised her. (personal obligation)

💡 Hint: For internal/personal obligation, use "must".

Exercise B: Choose mustn't or don't have to

1.

You _______ work on Sunday. It's your day off. (no obligation)

💡 Hint: "Don't have to" = no obligation (it's your choice).
2.

You _______ tell anyone the password. It's confidential! (prohibited)

💡 Hint: "Mustn't" = it is prohibited/forbidden.
3.

You _______ bring lunch. The company provides it for free. (not necessary)

💡 Hint: "Don't have to" = not necessary (optional).
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Speaking Preparation

4 minutes
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Practice Tips

Prepare your answers mentally or in writing. Use these questions as a base for professional English conversations.

💼 Prompt 1: Work Rules

Describe your workplace rules. What do you have to do every day? What mustn't you do? Are there any rules you think should change?

💡 Prompt 2: Giving Advice

A new colleague is starting. What should they do in the first week? What shouldn't they do? What must they remember?

📋 Prompt 3: Personal Obligations

Talk about your responsibilities. What must you do this week? What don't you have to do that you did before? What should you do more often?

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Congratulations!

You've completed lesson 2.2. You now understand how to use must, have to, and should for obligation and advice. Continue to lesson 2.3 to learn about permission and requests!

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