非谓语动词的用法中,及物和不及物动词的用法.

没有宾语，要加介词再加宾语
seat的用法
1. seat sb.就坐；让某人入坐；
You can seat yourself beside the window.
Don‘t worry，I’ll seat you on your seat.
2. be seated就坐；坐下；
When I came into the room， I found all the others seated
on the bench.

简单点seat oneself = be seated 是状态= sit

不用被动
seat oneself = be seated = sit

及物动词跟宾语不加介词，不及物动词需加介词；seat意为让别人坐，是及物动词，自己坐的话，要加反身代词。