Question

I had no key, so I -----------lock the door

Answer 1

I had no key, so I could not lock the door .

Explanation:

• A module auxiliary verb is a kind of verb that is used to show modality- that is the probability, ability, appeal, permission, or advice.

• Modal verbs always go along with the base form of other verbs that has the cognitive content.

• Words like can, could, would, might, will, should, shall, may, and ought are the modal auxiliary verbs.

• They never change their forms like other verbs- shows the probability, need, or willingness.

Answer 2

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I had no key, so I couldn't lock the door.