Question

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

Answer 1

Answer:

• I had no key, So I didn't lock the door.

Explanation:

• Let's explain why 'didn't' has been used in the blank space.
• 'Did' is an example of Past Indefinite Tense.
• In the blank space 'didn't' has been used to complete the meaning of the sentence.
• Here didn't means 'did not'
• Verbs present form is used after the auxiliary verb 'did' as a main verb in Simpl past tense. Lock plays the roll of main verb and it is written in present form.

Answer 2

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

Explanation:

• We have to fill the blank with appropriate word.

• Here 'lock' is a Verb and thus we must put an auxiliary verb that best suits the expression for inability to lock the door.

• The Tense of the sentence is Past Indefinite Tense.

• Ability ➜ could, inability ➜ couldn't.

• Thus the complete sentence: I had no key, so I couldn't lock the door.

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