Modals of Suggestion & Obligation
Modals that are used for suggestion, advice and obligation are: might, should, ought to, have to and must.
Review the following examples and try to figure out how each modal is used.

Akane: I have a terrible toothache and aspirin is not working.
Mizuki: You might consider seeing Dr. Endo. He's a good dentist.

Abdullah: I fell down and hurt my knee. Look. My right knee is twice as big as the left one now.
Fawaz: It looks terrible. You should see a doctor.

Ming: Why are all these people here? Did something happen?
Chantal: Yes. Kento tried a trick on Julie's skateboard, but he fell off and broke his leg. It looks awful. He may have to go to the hospital and have surgery.
Ming: That really is so bad. He will have to miss some classes. Julie ought to be more careful about letting other people use her skateboard.

Did you notice that, unlike all other modals, the so called pseudo-modal, "have to", can follow another modal?

Now, let's practice using modals of suggestion, advice and obligation. Do not use a modal of possibility. Select the best response to each situation below.

1. It's raining outside.

We might bring an umbrella.
We should bring an umbrella.
She have to bring an umbrella.
She will has to bring an umbrella.

2. He can't go to the party tonight.

We has to study for the test.
He might study for the test.
He has to study for the test.
He should study at least 2 hours for the test.

3. I don't know what to do today.

It doesn't matter. It might rain today.
Everyone should know what to do.
Really? I might know what to do.
You might think about studying; your grades are so bad.

4. The dog ate Dong Hyun's lunch!

Dong Hyun must be hungry.
Dong Hyun might not like pizza anyway.
Dong Hyun, you might be more careful next time.
Dong Hyun has to get a cat.

5. The teacher marked him absent for having a cellphone out during class.

He has to pay attention to the rules.
He must be a bad student.
He should not obey the rules.
He might not know the rules.
If you did not complete all five sentences correctly, please try again.
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modals

Quirk, R., & Greenbaum, S. (1973). A concise grammar of contemporary English (p. 37) Harcourt Brace Jovanovich, Inc.