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_____________ (you / lock) the door before you left the house? 
Correct answer is 'Did you lock'. Can you explain this answer?
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_____________ (you / lock) the door before you left the house?Correct ...
Did you lock the door before you left the house?
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_____________ (you / lock) the door before you left the house?Correct ...
Answer:

Explanation:

The given sentence is in the form of a question, which means it requires an auxiliary verb to be added before the subject of the sentence. In this case, the auxiliary verb would be 'did'.

Reasoning:

The reason 'did' is used as the auxiliary verb is because the sentence is in the past tense, and 'did' is the past tense of 'do'. The main verb 'lock' remains in its base form because it follows an auxiliary verb. Therefore, the correct sentence would be 'Did you lock the door before you left the house?'

Summary:

To summarize, when asking a question in the past tense, an auxiliary verb (such as 'did') must be added before the subject of the sentence, and the main verb remains in its base form.
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_____________ (you / lock) the door before you left the house?Correct ...
The sentence is an interrogative sentence as we can see there is a question mark at the end. the verb left shows that the question is about something u have supposedly done in the past. let's take an example :
_ (you/eat) apples and drink milk?
answer: do you eat apples and drink milk?
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