chair is comfortable to sit on 还是in ?

the wood chair is very comfortable The sofa is __________(comfortable) than that chair chair is comfortable to sit on 还是in ? The chair is not comfortable enough.B:Yes,I agree.It is ( )A.comfortableB.too uncomfortableC.enough comfortable the chair is comfortable?the chair is comfortable to a sit b sit onc be sat d be sat on希望给出这方面的规律 the chair is comfortable to sit on为什么要加on? the chair is very comfortable to sit in 这个地方为什么要用in而不用on This chair is comfortable --------( )A.to sit B.to seat C.to sit on D.sit down 为什么选C The chair is comfortable to sit on/还是to be sat on?如果是to sit on 的话请解释下为什么不选后者 什么叫主动表被动The chair looks very hard,but it is very comfortable to sit on.为什么这句是主动表被动呢? The chair looks rather hard , but in fact , it is very comfortable to_______ . A. sitThe chair looks rather hard , but in fact , it is very comfortable to_______ .A. sit B. sit on C. be sat D. be sat on为什么选B My home is very comfortable.comfortable 为什么不是cosy The chair looked rather hard,but in fact it is very comfortable to sit on.各路英语才子们,小妹不知道句子中为什们会有个on,麻烦各位想想,给个回答, 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, 5．The chair looks rather hard,but in fact it is very comfortable ________ .A．to sit B．to sit on C．sit D．be sat on选哪一个,为什么? The chair is comfortable to___( )A.sit B.sit on C.be sit on D.sitting on我选的是A 请问什么时候后面要加介词,什么那时候不用? now that we don`t have enough books for everyone,you will have to ---- A share B share with为什么那这句话和The chair is comfortable to sit on.必须加on有什么不同呢？ This kind of chair looks hard ,but in fact it is comfortable __.A.to sit in B.to sit C.sitting on我个人感觉是选A ,..说什么is是动词,comfortable和 坐 是同时发生的,很不理解...我想问一下为什么选C