当to 是介词时后接doing
eg I am looking forward to hearing from you.
我很盼望你的来信.
pay attention to / make contribution to 当中的to 都是介词.所以要接doing.
当它是不定式符号时,当然就接动词.
be able to do
too + 形容词 + to do
To后面什么时候是不定式接do什么时候是介词接doing呢?
当to 是介词时后接doing
eg I am looking forward to hearing from you.
我很盼望你的来信.
pay attention to / make contribution to 当中的to 都是介词.所以要接doing.
当它是不定式符号时,当然就接动词.
be able to do
too + 形容词 + to do