Question

I used to think so (pick out modal auxiliary and state it's function)
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Answer 1

The modal auxiliary is 'used to' and it has been used to refer to a regular action in the past.

• It is a marginal modal verb and can be used only the past tense.
• Modal verbs are helping verbs which are used to indicate possibilities, requests, suggestions, obligations, etc.
• The various usages of this modal auxiliary is-

1. To describe a regular action in the past- Hari always used to take a walk after having dinner.
2. To describe something that was true in the past but not at the present- I used to love peanuts when I was a child.

• It can also be used for negative or interrogative sentences.

Answer 2

Answer: :)

I always used to think that she will be no longer with her family.