doing 是【动词-ing形式】,代替【常见动词的-ing形式】。一般在谓语动词前面或后面,,也可以在介词后面、形容词后面。例如:
【Learning a foreign language 主语】 is of great importance in modern society.
【Seeing主语】 is 【believing表语】
I have 【finished doing】 my my job and now I can have a rest for the momnet.
The movie is worth 【waching a second time.】
I am looking forward to 【hearing from】 you soon.
祝你开心如意!O(∩_∩)O~~
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