to加动词原形

当to作为动词不定式的标志时,后面加动词原形,作为介词的词性时,用v-ing的形式；

to后用动名词

be/get used to doing 养成做…习惯；

get down to开始做…;

look forward to…盼望…;

stick to…坚持做…；

lead to…导致…

这些动词后面接的to用动词原形

want, wish, hope, manage, pretend, decide, learn, agree, expect, demand, long, ask, care, choose, dare, fail, offer, plan, prepare, promise, refuse, desire, happen, appear, intend, would like to, be said to