现在进行时
主语为he she it that this或者名词单数等等
She isn't singing next to the room
The bird isn't flying in the sky
现在进行时被动语态
The kite isn't being flied
一般现在时
同样当主语是he she it that this或者名词单数等等
He isn't a student
That isn't right
动名词做主语时
Learning isn't the only way to earn your living
不定式做主语
To play the piano isn't my hobby
there be句型 (接可数名词单数或不可数名词时)
There isn't milk in the glass
等等.......................
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