用所给动词的正确形式填空。 1. My father always _________ (come) back from work very late. 2. The teacher is busy. He __________ (sleep) six hours a day. 3. Listen! Joan ________(sing) in the classroom. 4. _______ your brother ________(know) Japanese? 5. The boy ________ ( draw )a picture now. 6 .________Helen____________(wash )clothes? Yes , she is . 7 . What _______ you ______ ( do ) now?