you are singing in the cassroom改否定句

1. You are not singing in the classroom.2. 因为否定句需要在动词前加上not，表示否定。
3. 如果你在教室里唱歌，那么你现在不在唱歌了。

you are singing in the cassroom改否定句

否定句是：you aren't singing in the classroom.

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