Which sentence correctly expresses a strong obligation from an external source (e.g., a rule)?

• I must finish this report today; my boss is counting on me.

• I have to finish this report today; my boss is counting on me.

• I should finish this report today, but I might put it off.

• I ought to help you with that later.

• I need to buy more milk on the way home.

Complete the sentence with the most logical choice:

"The museum is free, so you ________ pay anything."

• mustn't

• don't have to

• shouldn't

• needn't to

• haven't to

Which modal verb is used to express a recommendation or moral obligation, but not a strict rule?

• must

• have to

• should

• need

• mustn't

"Look at those dark clouds. It ________ rain later."

Which word expresses a logical certainty or necessity?

• should

• ought to

• has to

• must

• need

Identify the sentence that expresses prohibition.

• You must try the chocolate cake here.

• You have to see a doctor about that cough.

• You needn't worry about the test; it's easy.

• You mustn't use your phone during the exam.

• You don't have to attend the meeting.

"Must" is more commonly used than "have to" for expressing obligation in American English.

The negative form "mustn't" means the same as "don't have to".

"Need" can function both as a main verb (e.g., "I need to go") and as a modal verb (e.g., "I needn't go").

"Ought to" is followed by a bare infinitive (without 'to').

The past form of "must" for obligation is "musted".

Which TWO of the following sentences express a LACK of necessity or obligation?

• You mustn't park here; it's a fire lane.

• You needn't bring food; there will be plenty there.

• She doesn't have to work on Fridays.

• He must remember to call his mother.

• They have to wear a uniform at school.

Select all the sentences that are grammatically CORRECT.

• I must to go now.

• She has to leave early

• They needn't to hurry.

• We don't need to decide today.

• You must not be late.

Which TWO questions are formed correctly?

• Do I must wear a tie?

• Have I to complete this form?

• Must I complete this form?

• Do I have to complete this form?

• Need I to complete this form?

Choose all the phrases that can correctly complete this sentence:

"The doctor said I ________ take this medicine twice a day."

• must

• have to

• should

• ought to

• need

Which of the following express a past obligation? (Choose all that apply)

• I had to leave early yesterday.

• I musted finish my homework last night.

• She needed to make an important call.

• We should have taken the train instead.

• They have to have arrived by now.

Identify the error in this sentence: "You haven't to tell anyone; it's a secret."

• You mustn't to tell anyone; it's a secret.

• You don't have to tell anyone; it's a secret.

What is the error in this sentence?

"She doesn't need make a reservation; I've already booked a table."

• She doesn't need to make a reservation, I've already booked a table.

• She needn't make a reservation, I've already booked a table.

The sentence "I must to call my parents every week" contains an error.

What is the correct form?

• I must call my parents every week.

• I have to call my parents every week.

What is the problem with this question?

"Have we to sign this form here?"

• Do we have to sign this form here?

• Must we sign this form here?

The sentence "You should have took the earlier train" contains an error.

What is it?

• You should have taken the earlier train.