介词in的用法：
1、在一段时间内
如: in the moring / in the afternonn / in summer / in two weeks
toby was born in 1985.
i will finish my homework in two hours.
2、在...之内，位置
toby lives in shenzhen.
there is a pen in the box.
3、穿着
i hate that gril in black.
is the man in blue your boss?
the man in white jaket is your teacher.
4、用...工具
please introduce yourself in simple english.
they are talking in loud voice.
5、在...当中，状态中
his life is in danger.
we are in deep sorrow.
6、在...方面
spend+时间+on sth/in doing sth
he spends two days on books/in reading books.