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am is are 怎么用的?

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am is are 怎么用的?
有时候加和不加的意思就不一样,那什么时候加?什么时候不加啊?比如
sometimes,he and she watch television和sometimes,he and she are watch television这第二句是两个人,加个are对吗?
am is are 怎么用的?
sometimes,he and she watch television这句是对的.
he and she are watch television是不对的,应改为he and she are watching television.正在看电视.
am is are是be动词,在句子中充当动词成分,watch也是动词,所以不能出现在一个句子里.be+doing是现在进行时的形式,所以是are watching television.
特别是一般现在式你要注意,有am is are 就不可以有其它动词出现在一个句子里.