问题 in/for three days在否定句中的区别

haven't done sth in/for three days在表示三天没干某事这层意思上有啥区别？

问题 be suited/suitable/fit for 短语辨析含义和用法？

下面3组短语都有“适合”的意思，但是究竟有什么“本质”的用法区别呢？be suited forbe suitable forbe fit for 

问题 英语中哪些情况要加-s,-ing,-ed,-d以及加to

英语中哪些情况要加 -s，哪些情况下要加 -ing，哪些情况下要加 -ed，哪些情况下要加 to，哪些情况下要加 -d。

问题 不定式(to do)和动名词(doing)做主语时的区别

请问专家：不定式to do 和动名词 doing 在做主语时，它们语义上有什么区别？

问题 This is all you need take（need 后为何没有 to）

This is all you need take.请问这个句子对吗？need 后面为什么没有to？

问题 commit的用法

...英语词典中commit词条有一个例句： They we were reluctant to commit themselves to an opinion.  我想问一下，commit oneself to 直接接sth而不接动名词的用法应该如何理解？是介词to后省略了一个动名词吗？还是to后接的名词应该有潜在...

话题 How would you like to do sth

话题 It was my first time to do

话题 This is my first time to do

话题 have/had known sb/sth (to) do ...

话题 If you should happen to see him

话题 It takes sb st to do sth

话题 involve sb to do sth有这样的用法？

问题 granted的问题

求问：Granted that he said so, he may not keep his promise. =It being granted that...（1）It being granted that...怎么理解，为什么=granted ?Granting that he said so, he may not keep his promise. （2）Granting that he said so中，granting作什么成分？

问题 Add sth to sth 和 add sth in sth 的区别

为什么用 Add some milk to coffee，而不能是 Add some milk in coffee