the birds are singing in the tree (改为否定句)
题目
the birds are singing in the tree (改为否定句)
答案
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
举一反三
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我想写一篇关于奥巴马的演讲的文章,写哪一篇好呢?为什么好
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