Ⅰn.是什么词性

词性是介词、副词、形容词、名词，例如：

1、He was in his car.他坐在他的车里。

2、We spent a few days in a hotel我们在一家宾馆住了几天。

3、My flatmate was in at the time我的舍友当时在房间里。

4、She looked up anxiously as he came in他进来的时候，她焦虑不安地抬起头来看了看。