Present Perfect vs Simple Past

_____ Tim _______ (finish) his work yet?

_____ he _____ (work) it yesterday?

They ________ (go) out a minute ago.

_____ Ann ________ (study) yesterday afternoon?

_____ you _______ (send) the letters yet?

_____ she ______ (call) him a week ago?

They __________ (not / see) the film yet.

Have you _______ (ever / be) in a TV studio?

______ you and Tom ________ (enjoy) the party last night?

Jane ________ (buy) her car two weeks ago.