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 ______ ?