Modals of Obligation (Must, Have to, Should) – English Grammar Exercises for A2
You are helping a colleague review their business report. You found a few mistakes and want to give them polite, helpful advice without sounding bossy. Read the sentences carefully and choose the best option (A, B, C, or D) to complete your feedback.
1 “I read your report. It is very good, but I think you ______ add more details to the introduction.”
(A) must
(B) should
(C) should to
(D) have
2 “There is a small spelling mistake on page 3 You ______ fix it before the meeting starts.”
(A) has to
(B) shouldn’t
(C) must to
(D) should
3 “The red text is hard to read on a screen. You ______ use dark blue or black instead.”
(A) should
(B) must to
(C) shouldn’t
(D) have
4 “I have some free time right now. ______ help you format these tables?”
(A) Have I to
(B) I should
(C) Should I
(D) Do I must
5 “The total cost in this chart looks a bit high to me. You ______ check the numbers again.”
(A) should to
(B) should
(C) musts
(D) have to
6 “You ______ send the email to the client yet. Let’s wait for the manager to approve it first.”
(A) shouldn’t to
(B) don’t have to
(C) shouldn’t
(D) mustn’t
7 “Before you close the document, you ______ save a copy on the shared company drive.”
(A) must
(B) should saving
(C) has to
(D) should
8 “This graph is a little confusing. What ______ we do to make it clearer?”
(A) do we must
(B) should
(C) have we to
(D) we should
9 “I think you ______ print a paper copy to check for errors. It is much easier to read on paper.”
(A) have
(B) must to
(C) should
(D) should printing
10 “The presentation is almost 50 slides. You ______ make it so long, or people will get bored.”
(A) shouldn’t
(B) don’t have to
(C) haven’t to
(D) mustn’t
11 “Slide 12 has old information from last year. You ______ delete it to avoid confusion.”
(A) should to
(B) shouldn’t
(C) should
(D) must
12 “If the report is not ready, you ______ tell the manager now. Don’t wait until the deadline.”
(A) must to
(B) should
(C) has to
(D) shouldn’t
13 “Comic Sans is a fun font, but you ______ use it for a formal business report.”
(A) haven’t to
(B) don’t have to
(C) mustn’t
(D) shouldn’t
14 “You ______ worry too much about this first draft. It is already a great start!”
(A) shouldn’t
(B) shouldn’t to
(C) must
(D) haven’t to
15 “You look very tired from typing all morning. You ______ take a short coffee break.”
(A) having to
(B) must
(C) should
(D) should to
16 “The client’s name is spelled differently here. You ______ double-check it with their original email.”
(A) should
(B) has to
(C) must to
(D) should checking
17 “There are no page numbers. You ______ include them so the reader can follow easily.”
(A) shouldn’t
(B) should to
(C) have
(D) should
18 “You ______ delete the original data file. We might need it later if we make a mistake.”
(A) don’t have to
(B) shouldn’t
(C) shouldn’t to
(D) haven’t to
19 “Colleague: ______ change the title of the report?” – “You: Yes, a shorter title is much better.”
(A) Do I should
(B) Should I
(C) Must I to
(D) Have I to
20 “Overall, it is a fantastic report. You ______ just review the grammar one more time.”
(A) should
(B) must
(C) should to
(D) have
ANSWER KEY & EXPLANATIONS
1 Key: (B) should
Explanation: – Why it’s correct: “Should” is the most polite and natural way to suggest an improvement to a colleague.
- Common Mistake (A): “Must” is too bossy and authoritative for peer-to-peer feedback.
- Structural Error (C): Never put “to” after “should”.
- Structural Error (D): “Have” lacks “to”.
2 Key: (D) should
Explanation: – Why it’s correct: Pointing out a mistake and offering a friendly recommendation to fix it.
- Structural Error (A): “Has to” is incorrect for “You”.
- Meaning Trap (B): “Shouldn’t” means it’s a bad idea to fix it, which makes no sense.
- Structural Error (C): “Must to” is grammatically invalid.
3 Key: (A) should
Explanation: – Why it’s correct: Suggesting a better alternative (dark blue or black).
- Structural Error (B): “Must to” is invalid.
- Meaning Trap (C): “Shouldn’t” contradicts the sentence.
- Structural Error (D): “Have” lacks “to”.
4 Key: (C) Should I
Explanation: – Why it’s correct: We use “Should I…?” to offer help politely or ask for an opinion.
- Structural Error (A): “Have I to” is invalid.
- Structural Error (B): Statement word order, not a question.
- Structural Error (D): Never mix “Do” and “must”.
5 Key: (B) should
Explanation: – Why it’s correct: A gentle suggestion to review something that looks wrong.
- Structural Error (A): “Should to” is invalid.
- Structural Error (C): Modals never take an “s”.
- Meaning Trap (D): “Have to” sounds like you are ordering them to do it.
6 Key: (C) shouldn’t
Explanation: – Why it’s correct: “Shouldn’t” gives strong advice against doing something (sending it early).
- Structural Error (A): “Shouldn’t to” is invalid.
- Meaning Trap (B): “Don’t have to” means “you are not forced to, but you can if you want.” Sending it early is a bad idea, so “shouldn’t” is better.
- Meaning Trap (D): “Mustn’t” means “I forbid you,” which is too aggressive for a colleague.
7 Key: (D) should
Explanation: – Why it’s correct: A helpful reminder of best practices.
- Meaning Trap (A): “Must” is too commanding.
- Structural Error (B): Cannot use V-ing after a modal.
- Structural Error (C): “Has to” is wrong for “you”.
8 Key: (B) should
Explanation: – Why it’s correct: Asking for advice or opinions on how to solve a problem together.
- Structural Error (A): “Do we must” is invalid.
- Structural Error (C): “Have we to” is invalid.
- Structural Error (D): Statement word order.
9 Key: (C) should
Explanation: – Why it’s correct: Offering a personal tip/suggestion (“I think you should…”).
- Structural Error (A): “Have” lacks “to”.
- Structural Error (B): “Must to” is invalid.
- Structural Error (D): Cannot use V-ing after a modal.
10 Key: (A) shouldn’t
Explanation: – Why it’s correct: Advising them that making it too long is a bad idea.
- Meaning Trap (B): “Don’t have to” implies they can make it 50 slides if they want, but the speaker is actively advising against it.
- Structural Error (C): “Haven’t to” is invalid.
- Meaning Trap (D): “Mustn’t” is too bossy.
11 Key: (C) should
Explanation: – Why it’s correct: A clear, helpful suggestion to improve the slides.
- Structural Error (A): “Should to” is invalid.
- Meaning Trap (B): “Shouldn’t” is illogical here.
- Meaning Trap (D): “Must” is too strict.
12 Key: (B) should
Explanation: – Why it’s correct: Giving good professional advice.
- Structural Error (A): “Must to” is invalid.
- Structural Error (C): “Has to” is wrong for “you”.
- Meaning Trap (D): “Shouldn’t” is bad advice here.
13 Key: (D) shouldn’t
Explanation: – Why it’s correct: Suggesting that using a fun font is unprofessional and a bad idea.
- Structural Error (A): “Haven’t to” is invalid.
- Meaning Trap (B): “Don’t have to” is the wrong meaning.
- Meaning Trap (C): “Mustn’t” is a strict prohibition, too aggressive for a font choice.
14 Key: (A) shouldn’t
Explanation: – Why it’s correct: A friendly, comforting piece of advice.
- Structural Error (B): “Shouldn’t to” is invalid.
- Meaning Trap (C): “Must” completely reverses the intended comforting meaning.
- Structural Error (D): “Haven’t to” is invalid.
15 Key: (C) should
Explanation: – Why it’s correct: Suggesting a break is a classic use of friendly advice.
- Structural Error (A): “Having to” is invalid here.
- Meaning Trap (B): “Must” turns a friendly suggestion into a weird command.
- Structural Error (D): “Should to” is invalid.
16 Key: (A) should
Explanation: – Why it’s correct: Pointing out a discrepancy and suggesting a fix gently.
- Structural Error (B): “Has to” is wrong for “you”.
- Structural Error (C): “Must to” is invalid.
- Structural Error (D): Cannot use V-ing after a modal.
17 Key: (D) should
Explanation: – Why it’s correct: Recommending a formatting improvement.
- Meaning Trap (A): “Shouldn’t” is bad advice here.
- Structural Error (B): “Should to” is invalid.
- Structural Error (C): “Have” lacks “to”.
18 Key: (B) shouldn’t
Explanation: – Why it’s correct: Strong advice against a potentially risky action (deleting data).
- Meaning Trap (A): “Don’t have to” implies deleting it is an option, but the speaker wants to warn them not to do it.
- Structural Error (C): “Shouldn’t to” is invalid.
- Structural Error (D): “Haven’t to” is invalid.
19 Key: (B) Should I
Explanation: – Why it’s correct: The colleague is asking for the reviewer’s opinion.
- Structural Error (A): Never mix “Do” and “should”.
- Structural Error (C): “Must I to” adds an illegal “to”.
- Structural Error (D): “Have I to” is invalid.
20 Key: (A) should
Explanation: – Why it’s correct: A final, polite recommendation.
- Meaning Trap (B): “Must” is too harsh for the final encouraging sentence.
- Structural Error (C): “Should to” is invalid.
- Structural Error (D): “Have” lacks “to”.
GRAMMAR POINTS TO REMEMBER
- Should vs. Must/Have to (Office Etiquette):
- When communicating with colleagues at the same level, using Must or Have to can sound bossy, rude, or aggressive (like you are giving them orders).
- We use Should to give Constructive Feedback. It tells your colleague: “This is a good idea to improve your work, but I am not your boss.”
- Example: “You should check the spelling” (Polite suggestion) vs. “You must check the spelling” (Bossy command).
- Shouldn’t (Advising Against Something):
- Use Shouldn’t when you want to warn a colleague that something is a bad idea or unprofessional.
- Example: “You shouldn’t use red text.”
- Asking for Opinions (Should I…?):
- Use Should I or What should we… to ask for opinions or offer help politely.
- Example: “Should I help you?” / “What should we do?”
- The Grammar Rules:
- Rule 1: NEVER put “to” after “should” or “must”. (Correct: You should save it. Incorrect: You should to save it).
- Rule 2: NEVER add “s” or “ing” to the verb directly after a modal. It is always the base verb.