这个问题太笼统了.
给你个例子吧.
A:will you help me when i am tired?
B:yes.when you have a tire.
A:how long will it take to fly from Beijing to Shanghai?
B:one minute
A:Thank you!
这个问题太笼统了.
给你个例子吧.
A:will you help me when i am tired?
B:yes.when you have a tire.
A:how long will it take to fly from Beijing to Shanghai?
B:one minute
A:Thank you!