his hobby is building model planes and ships.model 后面为什么不加of

his hobby is building model planes and ships.model 后面为什么不加of His hobby is to make model planes.为什么不能用His hobby is making my brother ____I is fond of making model planes.A.and B.as w 1.Her hobby is ____ model planes .A.collected B.collecting C he is showing his model ships to us.(改为同义句) tom has a lot of ______ (兴趣) in making model planes 今天就要,好的加 make model ships more than20 ships I would like--- to.Music and ------ model planes A listening Tom and Betty_______(make)model planes next Sunday. Sometimes they make model ships , make model ships的音标 My brother has a ____ (collect) of model planes