Faced with this problem,i feel so puzzled;像这里ed的作状语,可以还原
i am faced with.....一般可以搭配的。
Faceing this problem,i feel so puzzled;表同时进行的动作,强调这个动作正在发生;
to do 一般表示目的,义务做的事,有时也是固定搭配
To help others is our duty;
追问不表同时进行时,什么情况用doing?
追答句子成分中作主语 用doing结构
追问举个例子好吗》、?
追答Watching TV is very interesting ,