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baby--- family---
leaf--- wolf---
boys
girls
buses
boxes
babies
families
leaves
wolves
This is a man .
These are men.
man --- men
This is a woman .
These are women .
woman --- women
These are children .
This is a child .
child --- children
Men ,
women
and children
are people .
单数变为复数式，
少数名词不规则。
Boy、girl 加“s”,
man、woman “a”变“e”，
child 后加“ren、ren”，
people 的复数是原形。
A boy is flying a kite .