The boy in the black jacket,whose back you can only see.

The boy in the black jacket,whose back you can only see. Do you know the boy in a black jacket?为什么这里用in Can you see the boy? Only in the darkness can you see the stars.为什么是can you,而不是 y The boy () is wearing the black jacket is very clever You can see __ boy and ___ girl in the room.用a,an ,the 填空 （）the blackboard,you can see two black and white you can see the river across which the boy swam In the day we can see only the ( ) What color can you see?I can it see the black color.I can on in the picture you can see a boy is swmming .His father is （ Only in the darkness can you see the stars.这句话中为什么can放在这个位置