在什么情况下，to后面的动词要加ing
一般的结构是主干动词+副词+介词，例如look forward to，在这个短语中，to就是介词，所以这个词组之后不能直接跟动词，必须跟名词或动名词才行。
例如：I’m looking forward to the party；
She looks forward to meeting you.
除了动词加 to doing 的结构外，还能看到形容词加 to doing 或者名词加 to doing结构，他们的道理相通。这里的 to 都是介词。
Most football fans are far more addicted to watching football on TV than watching a game of football.
扩展资料
to do与to doing的区别：
1、时间不同
forget/ remember doing：表示动作发生在“忘记”、“记得”之前
forget/ remember to do：表示动作发生在“忘记”、“记得”之后
I forgot to do my homework. 我忘记要做家庭作业了。
I forget having finished my homework. 我忘了我已经做完作业了。
2、功能不同
go on/ leave off/ stop doing: -ing分词作宾语
go on/ leave off/ stop to do: 不定式作目的状语
My father left off working and had some coffee. 我爸爸停下工作，喝了些咖啡。
My father left off to have some coffee. 我爸爸停下来，喝了些咖啡。
3、含义不同
在try, mean, can’t help等动词后接的是ing分词还是to do, 与动词本身含义相关。
try to do sth 努力做某事
try doing sth 试着做某事
mean to do 打算做某事
mean doing sth 意味着做某事
can’t help to do sth 不能帮忙做某事
can’t help doing sth 情不自禁做某事
to 可以和动词一起构成动词不定式 to do, to 也可以做介词，后跟动词的ing 形式，
to doing,常见的 有 look forward to doing, get down to doing , be devoted to doing, come close to doing ……
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