do和be动词的用法区别比如：①__?__this programme.(I'm not understand/I don't understand)②Jim and his father__?__.They are asleep.（aren't watching TV/don't watching tv)③A:Why______?B:Because I'm happy.(smile) 要怎么做?为什么?
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do和be动词的用法区别比如：①__?__this programme.(I'm not understand/I don't understand)②Jim and his father__?__.They are asleep.（aren't watching TV/don't watching tv)③A:Why______?B:Because I'm happy.(smile) 要怎么做?为什么?
do和be动词的用法区别
比如：①__?__this programme.(I'm not understand/I don't understand)②Jim and his father__?__.They are asleep.（aren't watching TV/don't watching tv)③A:Why______?B:Because I'm happy.(smile) 要怎么做?为什么?
不要光说答案，要解释。谢谢！
do和be动词的用法区别比如：①__?__this programme.(I'm not understand/I don't understand)②Jim and his father__?__.They are asleep.（aren't watching TV/don't watching tv)③A:Why______?B:Because I'm happy.(smile) 要怎么做?为什么?
1、I don't understand
解释：understand是动词,动词的否定一般是在前面加don't ,而且如果动词用在be动词后面要变ing形式.
2、aren't watching TV
解释：这句话是说Jim和他的爸爸不在看电视,表示的是一种状态,用正在进行时,即be动词+动词ing形式；don't是助词,后面必须加动词原形.
3、are you smiling
解释：smile是持续动词.别人看到你正在笑,才会问你为什么笑,因此用be smiling；根据回答I'm happy得知时态是现在,因此用be动词用现在时,与you对应的be动词现在时是are.