Question

My sister _______ dance so well ,when she was in school ( use a semi modal verb)

Answer 1

Answer:

used to

Explanation:

It is not a complete Auxiliary verb

Answer 2

My sister used to dance so well, when she was in school.

• Modal Auxiliary verbs are verbs that are used to express ideas pertaining to possibility, obligation, duty and so on.

• Semi modals are small phrases, used to express the same ideas as auxiliary verbs, only difference being that semi modals are used as a combination of auxiliary verbs and preposition.

• Semi modals are generally used with the preposition 'to'. For example - used to,ought to.

• Sometimes, semi modals are also used without the infinitive 'to'. Example - need, dare. These can also be used as main verbs.

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