今天遇到一個(gè)外教，我的天，特別娘，不過發(fā)音挺標(biāo)準(zhǔn)的

看我，瞌睡兮兮，上來一句，蒙了

were you very tired this morning.

突然想說這一句，可是說不出

the post office opens at nine in the morning.

對(duì)于這句提問的句子，語法是這樣

do you know when the post office opens?

do you know +疑問詞+陳述句語序

以后能夠用到的句子，這句可以

I need to send an important letter as soon as possible,but i don't want to miss my geography class.

我盡快做啥，但是不想錯(cuò)過什么

對(duì)于寄信的表達(dá)句子，必須記住

put a stamp on the envelop and leave it in a mailbox.