IN的词性是什么

in 是介词 come in是动词
一般英语表达里come in 后面不会加the room,
如果你要说走进房间，可以说go into the room
come in 是走进来的意思，如果是“he comes in the room"你要怎么翻译呢？中文你也不会这样表达
给几个例句参考：A girl came in with a textbook in one hand and chalk in the other.
一位姑娘一只手里拿着一本书，另一只手里拿着粉笔，走了进来。
Two teachers came in, one was our maths teacher, the other was your English teacher.
两位老师进来了，一位是我们的数学老师，另一位是你的英语老师
The doctor came in, followed by several nurses.
医生进来了,身后跟着几个护士.

如果加宾语，这个应该是不及物动词来的，不可以直接加宾语
come into才是及物动词

in是介词，
可以加宾语，如h:He comes in the room.

in是介词啊。