Can you tell me ------------ the truth?

why did not you speak

that why did you not speak

That why did you not speak

why you did not speak

Can you tell me why you did not speak the truth?

The above sentence is related to the past tense

so, we choose "Option D" because "Option D" is best to keep the meaning of the original sentence

Did not is used in simple past

Didn't is used to make a negative sentence for all subjects

ND11-2-2023