Question

急,小弟没分 不好意思could not do...but do 是因为有do所以后面没to,但是有句子had no c

Answer 1

ut/except 除了……之外,

前文有实义do的任何形式时才省略to 如是do或者do的变形（如有doing, done,did等）在前面才可以

例如：

1)i have no choice but to stay at home

2)there is nothing to do but stay at home

3)i did nothing but stay at home

2)3)句中do都是有实义的,“做”的意思