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This is a tree.
These are trees.
bird
birds
This is a beautiful bird.
These are beautiful birds.
egg
eggs
This is an egg.
These are eggs.
sheep
sheep
This is a sheep.
These are sheep.
单复数同形
grass（不可数名词）
What are those?
They are grass.
那些
These are grass.
Those are grass.
flowers trees grass
sheep eggs birds
Let's play games
谁的耳朵最灵敏？
Pair work:
What are those?
They are green birds.
Pair work:
What are those?