she'll be at the library for about 30 minutes这个句子中,be at at的用法.

she'll be at the library for about 30 minutes这个句子中,be at at的用法.
she'll be at the library for about 30 minutes
这个句子中,be at
at的用法.

she'll be at the library for about 30 minutes这个句子中,be at at的用法.
为你解答.
She'll be at the library for about 30 minutes.
她要在图书馆待半小时左右.
解释：at the library,在图书馆.这个介词短语在本句中作表语,与be动词一起构成谓语.
be at并不能看成一个词组.