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 ______ ?