the birds are singing in the tree (改为否定句)

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the birds are singing in the tree (改为否定句)
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the birds are singing in the tree (改为否定句)
the birds are singing in the tree (改为否定句)

the birds are singing in the tree (改为否定句)
The birds aren't singing in the tree.( aren't = are not)
现在进行时否定句在 be 后加not

the birds aren't singing in the tree.

The birds aren't sing in the tree.