哪些情况to do 和doing可以混用比如这个两个句子有啥区别It also costs money for universities keeping their libiaries open.It also costs money for universities to keep their libiaries open.

哪些情况to do 和doing可以混用比如这个两个句子有啥区别It also costs money for universities keeping their libiaries open.It also costs money for universities to keep their libiaries open. 动词后面可以加to do和doing有哪些 我知道了英语中哪些词语后加doing sth和哪些词语后面加to do sth.但是谁可以告诉我哪些词后面加do sth watch doing 和watch to do 都可以吗 英语doing和to do后面+doing和to do的单词、短语有哪些?如finish doing sth,look forward to doing sth,see sb doing sth,learn to do sth 有些动词后既可以加TO DO,又可以加DOING,此时它们的意义不同,但区别不大,通常可以互换.请问:START TO DO ,START DOING ,BEGIN TO DO ,BEGIN DOING 在什么情况下不能互换? 哪些词既可以加to do还可以加doing have a chance to do,have a chance of doing有区别吗?have a chance to do,和have a chance of doing有区别吗?什么情况下用to do,什么情况下用 of doing? see sb do/doing ; be seen to do/doing 和这里see用法类似的词有哪些? 请问：learn to do 和learn doing 有什么区别?分别在什么情况下使用? 短语只+doing ； +to do；既可+doing又可+to do 的 意思区分看来短语的意思也要 不好意思 是只+doing 的v有哪些 只 +to do的又有哪些 既可+doing又可+to do 的v有哪些，把既可+doing又可+to do 的v+doing和+to TO do和doing和do都可以放在句首么 to do和to doing的区别 like to do 和like doing的用法有什么区别什么时候用like to do like doing和like to do 可以互换吗? 初中和高中哪些动词+to do,哪些动词＋doing?尽可能多些 to do 和doing分别用在哪里?在什么情况下用to do,什么时候用doing?最好能适当举些简单的例子 英语的哪些词是可以加doing却不能加to do?最好加上中文, 初中英语中有哪些单词只能加to do哪些只能加doing,哪些既可以加todo又可以加doing