肯定：
主语（I/You/He/She/It/We/You/They)+be动词（am/is/are)+动词ing
例句：
I am watching TV.
She is eating lunch.
It is raining outside.
否定：
主语（I/You/He/She/It/We/You/They)+be动词（am/is/are)+not+动词ing
例句：
I am not reading a book.
We are not listening to the music.
They are not doing their job.
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