a chair to sit on;a pen to write with.这种怎么判断最后要不要加介词?从句中，比如说：Although the lecture had already been on for five minutes ,I still was not able to find a chair_________.这是to sit 还是to sit on .为什么

I found a chair to sit on 是sit in a chair还是sit on a chair? sit in a chair还是sit on a chair? I found a chair to sit to sit on做什么成分? the boy didn't know_____ .a.which chair to sit on b.which chair to sit选 A对吧.CHAIR做宾语,所以加ON This chair is comfortable --------( )A.to sit B.to seat C.to sit on D.sit down 为什么选C I found a chair to sit onto sit on在句中作什么成分? I haven't got a chair ________.A.to sit B.for to sit on C.to sit on D.for sit would you please ( )me a chair ( A.give;to sit in B.give;to sit Cgiving;sit D .to give;sit on sit ( )a chair I haven't got a chair ______.A.to sit B.to sit on 选择哪个 并且讲解一下原因. You should get a chair _____ on.A.sit B.to sit C.sitting D.to sitting原因是什么? A dog is on the chair A.sit B.sitting C.siting D.to sit回答者请说出原因, i haven't got a chair( ) a:to sit b:to sit on c:for me to sit d:for sitting 搬椅子来坐 I brought a chair by myself to sit on? go to sit on the chair for a few minutes的中文 he has got a chair to sit ____ but nobody to talk______A on to B / withC on /D ' to 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