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What are these?
They are
这些
它们 是
clocks.
A: What's this ?
B: It's a pig.
A: What are these？
B: They're pigs.
这个
这些
它们是 一些猪。
they're = they are
A: What's that ?
B: It's a cow.
A: What are those？
B: They're cows.
那个
那些
A: What's this ?
B: It's an apple.
A: What are these？
B:
这个
这些
These are apples.
A: What's that ?
B: It's a pear.
A: What are those？
B: They're pears.