1) are you doing / am translating / you have been translating / have / is/ have been working / translate / have been translating.
2) am examining / is finished / it will be / have already passed / are having / are doing.
3) made / am preparing / was working / had been writing / would take.
4) have shown / was shown / hasn't been shown / are waiting / will be shown / they come / would come / would be shown.