crowds of people stand on the shore watching it drifting away until they can be seen no more.
问题描述：
crowds of people stand on the shore watching it drifting away until they can be seen no more.
这句话里的动名词watching和drifting可以用不定式代替不?
答
不可以.用动名词形式表达,则说明动作正在进行.如果换了不定时,则说明的是一种目的.想做某事.这是不能换的.而且有时候介词后面只能加动名词形式,有的动词则只能用不定时,不定时和动名词形式表达的的意思不一样.比如remember doing 和remember to do就不同