大家帮我做一下英语题（句型转换）

1.I am sad because my mother is ill.(就加粗部分提问)

2.Ying tian asked his teacher how he could play the violin well.(改为直接引语)

3.I should do my homework.(就加粗部分提问)

4.I don't know what to do.(改为含有宾语从句的复合句)

1. Why are you sad?
2. Ying tian asked his teacher,"How can I play the violin well?"

3.What should you do?

 

4.I don't know what I should/will do.

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