There is a comfortable chair to sit on .为什么加on 而有的句子不加介词,像用take part而不用take part in最好举几个例子,
问题描述：
There is a comfortable chair to sit on .为什么加on
而有的句子不加介词,像用take part而不用take part in
最好举几个例子,
答
看看动词是否及物动词
如果是的话不用
否则就要
答
chair 与sit on 之间要构成一种逻辑上的动宾关系。
例如this room is comfortable to live in
this game is veluable to take part in
答
sit on the chair正如楼上说的是逻辑上的动宾关系而你问的我找了例句How many of you are going to take part?你们多少人准备参加?To take part in a wrestling match with.与（某人）一起参加摔跤比赛我们可以看出...
答
基本上都应该加。
I enjoy the activity I take part in.
This is the matter I should take care of.
This is the problem I am now working on.
The material the chair is made of is bamboo.