Obligation & Necessity (must/have to) Exercises PDFSet 4: Mixed Modals of Obligation Exercises

20 questions·15 min·Answers included·Explanations included

Preview: Questions

Fill in the blank with the correct option.

1.You ___ drive on the right in the United States. It's the law.

a) have tob) must toc) needd) having to

2.She ___ see a doctor last week because she had a high fever.

a) mustb) has toc) had tod) needed

3.You ___ eat in the laboratory. Food could contaminate the samples.

a) don't have tob) mustn'tc) needn'td) don't need to

4.I ___ get up early tomorrow. It's my day off.

a) mustn'tb) don't have toc) haven't tod) won't must

5.We ___ leave now, or we'll miss the last train.

a) mustb) havec) must tod) are need to

... and 15 more questions in the PDF

1.have to

2.had to

3.mustn't

4.don't have to

5.must

... and 15 more answers in the PDF

1."have to"(a)

Use 'have to' for external rules and laws. Driving on the right is a legal requirement in the US.

2."had to"(c)

Use 'had to' for past obligation. 'Last week' requires the past tense, and 'must' has no past form.

3."mustn't"(b)

'Mustn't' = prohibition. Eating in the lab is forbidden because it could damage the experiments.

4."don't have to"(b)

'Don't have to' = not necessary. It's a day off, so there is no obligation to get up early.

5."must"(a)

Use 'must' for urgent personal obligation. Missing the train would be a serious problem, so the speaker feels strongly about leaving now.

... and 15 more explanations in the PDF

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