今天遇到一个外教，我的天，特别娘，不过发音挺标准的
看我，瞌睡兮兮，上来一句，蒙了
were you very tired this morning.
突然想说这一句，可是说不出
the post office opens at nine in the morning.
对于这句提问的句子，语法是这样
do you know when the post office opens?
do you know +疑问词+陈述句语序
以后能够用到的句子，这句可以
I need to send an important letter as soon as possible,but i don't want to miss my geography class.
我尽快做啥，但是不想错过什么
对于寄信的表达句子，必须记住
put a stamp on the envelop and leave it in a mailbox.
