用is和are造句:否定和肯定.

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用is和are造句:否定和肯定.

用is和are造句:否定和肯定.
用is和are造句:否定和肯定.

用is和are造句:否定和肯定.
There is a tree near the house./There isn't a tree near the house.
There are some flowers in the garden./There aren't any flowers in the garden.

He is a worker. He is not a worker
We are students.We are not students