问题 once that…为什么是错的

Remember that you won't be able to cancel the contract once that you've signed.这个句子中的 once that 用错了吗？为什么呢？

问题 不定式为什么没有to

I never know him do such a thing.这个句子中的动词do为什么没有to？

话题 but to do

话题 as as to

话题 left to itself

话题 be likely to

话题 to be adj

话题 to that intended

话题 不定式省略to

话题 不定式，to省略

话题 be going to

话题 to have been

话题 to do sth

话题 be to do

话题 to be done