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Be动词和系动词是一个东西吗
新概念英语第一册59至63课知识点
视频时间 23:01
they are talking about their homework(改为否定句)?
答:
They are talking about their homework.的否定句是They are not talking about their homework.说明:are talking是现在进行时,即
Be动词
+现在分词。只需在
be动词
后面+not,即可变成否定句。又如:肯定句:He is reading a book.否定句:He is not reading a book....
小学英语 is和 do 用法
答:
do是助动词;is是
be动词
棣栭〉
<涓婁竴椤
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