The chair is comfortable to___( )

The chair is comfortable to___( ) the chair is comfortable? the wood chair is very comfortable The sofa is __________(comfortable) than that chair The chair is not comfortable enough.B:Yes,I agree.It is ( ) the chair is comfortable to sit on为什么要加on? The chair is comfortable to sit on/还是to be sat on? the chair is very comfortable to sit in 这个地方为什么要用in而不用on 什么叫主动表被动The chair looks very hard,but it is very comfortable The handwriting is difficult to___ . chair is comfortable to sit on 还是in ? is on the chair