Knows

Have learnt

Begins

Visited

Sell

Will work

Didn't receive

Ask

Is working

Went

Havs written,hasn't sent

Have made

Haven't seen

Will answer

Do..arrive, are arriving

Did you switch off

Will he go

Haven't finished

Have already told

Have already answered

Have just sent

Is doing

Is typing

Went

Will discuss

Came,had already left

Had left

Удачи)