yangliwei is the first chinese to go into space中to go into s

定语。He is the first chinese who go into space。这样懂了吗 再问： I had a very difficult time finding the lost glasses。这句话是对的吗？为什么句中的finding不是to find (*^__^*) 嘻嘻 再答： 这个是固定用法。have difficulty/trouble/problem + (in) + doing sth。