I would say : "What HAVE YOU been doing lately?" ( "lately" as in recent times, not so long ago) Thank you kittie ! miau-prrrrRR

when we use simple past tense in a question and negative forms we use base form of the verb V1 in sentences.. what did you do? but we use the Present Perfect (have/has+V3) with unspecific expressions such as: ever, never, once, many times, several times, before, so far, already, yet, lately..etc what have you done lately?

Jenny-michu, you forgot about inversion: "what have you been doing" ^__^

Is it correct if I say '...?' No, it isn't correct. The right way to say is : What did you do earlier? Positive. I DID it earlier. (DID is the past of DO, in the positive sentences we need to change the verb into the past form). Negative. I didn't do it earlier. ( DIDN'T is the auxiliary, and DO is the verb without changes, because in negative sentences the verb remains the same). Question: DID you DO it earlier? (DID is the auxiliary and DO the verb without changes).

What did you do*