Question

英语加ing的用法

Answer 1

动词加ing做谓语情况. 做谓语时动词加ing前面必须加上be动词,形成be+动词ing (现在分词)作句子谓语，构成进行时态句子。. 例如: He is reading a book now. 他正在看书. He was watching TV when his mother came in. 他妈妈进来时，他正在看电视。. They've been waiting for you for three hours. 他们等你三个小时了.

-ing分词短语放在句子的前面做主语，但当-ing分词短语较长时，为了使句子保持平衡，常用it作形式主语，而将真正的主语放到句子的末尾。如：Reading makes a man perfect. 阅读使人完美。Crying over spilt milk is no use. —It is no use crying over spilt milk. 牛奶倒了，哭也无益。

-ing分词做真正的主语时常用于句型：It is no use doing…/ It is no good doing… / It is useless doing…/ It is worthwhile doing…