1）What to do next？=What will we / you do next？

　　接下来做什么？

　　2）Why go there？=Why do we / you go there？

　　为什么去那里？

　　9. 动词不定式的否定式

　　不定式的否定式是not / never to do...；不带to的不定式的否定式是not / never do...如：

　　They decide not to talk to each other.

　　他们决定不和彼此说话。

　　His parents tell him never to play soccer in the street.

　　他父母告诉他不要在街上踢足球。

　　九. 动名词（doing）

　　动名词相当于名词，在句子中可以做主语、宾语、表语、定语等。

　　1. 作主语

　　Fighting broke out between the South and the North.