Question

since when you( live) in this house? it's a correct tense please solve this .

Answer 1

Had" is the past tense of these two verbs. In the present tense, "have" is used for I, you, we, and they and all plural nouns. "Has" is used for he, she, and it, and for all singular nouns. ("Has" is the third person singular form of "have.")

Answer 2

since when you have lived in this house ?

is your correct answer.