动名词与不定式什么时候可以互相替换

1.一般来说,做后置定语的不定式多表示一个未来的动作. 而做后置定语的动名词有浓厚的"进行"的意味. 例如：
We can see the children's anxiety to go to the beach.(表示未来的动作)
The students waving red flags and banners lined the streets.(表示进行中的动作.) 动名词与动词不定式一般不互换.

2.不定式和动名词作宾语时，可以根据动词选择：
某些动词后既可以接不定式又可以接动名词，这种情况下就可以互换，这类动词有：like,love,hate,dislike,begin,start,continue等，例如
she likes playing(to play) chess in her spare time.

3.而某些及物动词只能接不定式作宾语，不能用动名词，这类动词有： hope,offer,help,expect,learn,demand,decide,ask,refuse,prepare,plan,choose,manage,pretend,fail,wish,agree等，例如she pretended not to see me when i passed by.

4.某些及物动词后只能接动名词做宾语，不能接不定式，这些词有mind,suggest,avoid,excuse,finish,allow,admit,resist,miss,enjoy,consider,imagine,iadvise,permit,prevent,delay,appreciate,give up, put off, feel like, consist on, can't helo等，例句people couldn't help laughing at the foolish emperor in the procession.

FYI