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现在进行时
——表示现在正在进行的动作
构成：主语+be动词+动词的现在分词+其它成分
We are having lunch.
He is reading a book.
The dog is running after a cat.
The boys are swimming across the river.
★变疑问句将be动词移到句首
Are we having lunch?
Is he reading a book?
Is the dog running after a cat?
Are the boys swimming across the river?
★变否定句在be动词后面加 not
We are not having lunch.
He is not reading a book.
The dog is not running after a cat.
The boys are not swimming across the river.
★特殊疑问句：what, which, how, where, who, etc.
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发表于 2016-7-11 22:23:15