动词加ing形式：例：go—going
1. listen—  __________    2. draw—  ________ 3. read—  ________ 
4. answer— _________   5. clean—   _________ 6. do—  _________

用动词正确形式填空：be ( are, am, is)
1. I_____ (be) doing homework now.
2. Mike and John ______ (be) drawing pictures.
3. Amy ____ (be) reading a book.
4. We are __________ (write) an e—mail.
5. Zhang Peng is _________ (listen) to music.
6. They _____ (be) _____________ (answer) the phone.