1. Her sister learns English by listening to tapes.(对画线部分提问)  
                          her sister learn English?
2. I've learned a lot that way.(改为一般疑问句)
                                     a lot that way?
3. He thinks that watching English movies is a good way to learn English.(改为同义句)
    He thinks            is a good way to learn  English                       English movies.
4. I think we should stay at home to do our homework tonight. (改为否定句)
    I                       we should stay at home to do our homework tonight.
5. It makes my listening skills better. (改为同义句)  
    It            my listening skills.