1.fall down/over摔倒:
When Tom was walking along the street,he suddenly fell down/over.
2.fall behind落后：跟不上步伐
If we donot keep on learn english everyday,we will fall behind ohters.
3.fall off从…摔下来.
Look out!Something is falling off the tall building.
4.fall out解散
Class is over,you all fall out.
5.take after 长得像
Although they are not twins,they takes after each other.
6.take care 保重、小心
It is a long and dangerous journey,take care baby.
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