英语什么时候用不定式？什么时候用动名词？
1） 动名词与不定式的区别：
动名词表达的是：状态,性质,心境,抽象,经常性,已发生的　
不定式表达的是：目的,结果,原因,具体,一次性,将发生的
2） 接不定式或动名词,意义相同.
3)在下列情况下,一般要用不定式：
①hate,like,love前有would(should)时,如：I'd like to have a cup of coffee.
②当谓语动词begin,continue,start等是进行式时,如：Thestudents are starting to work on the di fficult maths problem.
③begin,continue,start与know,understand等状态动词连用时,如：I soon began to understand what was happening.
⒋advise,allow,encourage,forbid,permit等动词后接动名词作宾语,或带不定式作宾语补足语.如：
Our teachers don't permit our swimming in the lake.
Our teachers don't permit us to swim in the lake.
4） 部分动词后接不定式或动名词时,意义差别较大,应根据句子语境选择使用.
①forget,remember,regret后接不定式,表示现在或未来的动作,接动名词表示动作已经发生.如：
Don't forget fo post the letter for me.
Have you forgotten meeting her in Beijing Airport?
Remember to close the windows before you leave.begin和start区别
I remember writing him a letter a year ago.
We regret to tell you that all of you are not invited toattend the meeting.
They regretted ordering these books from abroad.
动名词与不定式语义不同的有11 组：
1　stop to do    　stop doing   
2 forget to do    forget doing
3　remember to do  　remember doing     
4 regret to do    regret doing
5　cease to do    cease doing       
6 try to do      try doing
7　go on to do    go on doing       
8 afraid to do    afraid doing
9　interested to do  interested doing 
10 mean to do      mean doing
11 begin/ start to do  begin/ start doing

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