Question

He _____ have missed his train. (might/may)
b. She _____ not sleep last night. (could/can)
c. You _____ to help the needy. (ought/should)
d. The government _____ ensure free access to healthcare. (must/would)

Answer 1

Answer:

might..

could...

should..

must...

Answer 2

(a) He might have missed his train.

The form 'might' is used for all persons of the past tense. It is used to express speculation about the past action.

(b) She could not sleep last night.

'Could' is used for all persons in the past tense It is used to express ability and possibility. In the above sentence, it means that 'she' was not able to sleep last night.

(c) You ought to help the needy.

'Ought' is used to refer to Present, Past or Future Tense. It is used to denote the sense of duty or moral obligation. In the above sentence, it means that it is a moral duty to help the needy.

(d) The government must ensure free access to healthcare.

'Must' is used to denote strong belief or compulsion. In the above sentence, it means that it's a strong belief that government should ensute free access to healthcare.