-1

Which question in is past simple tense grammatically correct?

Who called you?

or

Who did call you?

2

In

Who did call you?

did call is past emphatic. It is used to emphasize the action of calling. This sentence is interrogative and the subject is not known; therefore, emphasis seems out of place. The verb form would be correct, however, if written as an emphatic statement:

He did call you.

In the other provided sentence,

Who called you?

the tense, past, works with the interrogative nature of the sentence. This sentence is valid.

1

The first option is correct because this instance is conveying a single, completed action. While I don't think the second sentence is incorrect grammatically, it wouldn't be regularly used in normal conversation.

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