She ________ hum pieces of music at the age of four. She is a talented singer.

—_____I help you ,sir ?    
—Yes, please.

Who is it be. it _____ be susan.  it _____ be susan.  he is in beijing now.     

句型转换。
1. My mother can play table tennis. (改为否定句)
    My mother ______ ______ table tennis.
2. Lingling's sister can type. (改为一般疑问句,并作否定回答)
    —______  Lingling's sister ______ ?
    —No, ______ ______ .
3. My mother and father are doctors at the hospital. (改为同义句)
    My ______ ______ doctors at the hospital.
4. Betty and Sam are from America. (对划线部分提问)
    ______ ______ Betty and Sam ______ ?

My mother can play computer games but my father _____ .

句型转换。

-Mom, _____ I go and play for a moment?
-OK.

You _____ smoke when you see the sign .