Listen听,只有正在发生的事,才能听见,所以用现在进行时态,主语是Miss Li,第三人称单数形式,所以用i s + 现在分词singing.
I(我) 用am ,you（你）用are,
Is 用于他,她,它
复数一律都用are
Listen Miss Li in the classroom.A is singing Bsings C to sin
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