doing nothing but/expect+to do还是doyou have nothing to do but waitthere was nothing else but to leave.为什么一句用TO一句不用

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doingnothingbut/expect+todo还是doyouhavenothingtodobutwaittherewasnothingelsebuttoleave.为什么一句用TO一句不用do

doing nothing but/expect+to do还是doyou have nothing to do but waitthere was nothing else but to leave.为什么一句用TO一句不用
doing nothing but/expect+to do还是do
you have nothing to do but wait
there was nothing else but to leave.为什么一句用TO一句不用

doing nothing but/expect+to do还是doyou have nothing to do but waitthere was nothing else but to leave.为什么一句用TO一句不用
很简单:如果前面有动词do以及do的其他形式,后面就不要加to.高中学过的.

but/expect前面有动词do或者do的其他形式,后面就不要加to.如果没有就加

记住:有DO无TO,无DO加TO

看成分
第一句是不定式做定语 but连接的是do和wait 前面的to是两个动词一起的不定式 wait前面的to就省略掉
第二句也是不定式做定语 but连接的是else和to leave 因为前面的else不是动词 没有必要用不定式 自然没有to 后面就要有to咯