Collecting coins (cost\costs?)time and money because old coins are very hard to get.选COST为什么不加S呢?

U like collecting coins very 1,000 collecting no coins The old man q____ likes collecting coins. that boy was interested in collecting coins that boy___ ____ _____ ____ collecting coins 英语 Why don't you collec coins?同义句‘ ( ) （ ） collecting coins英语Why don't you collec coins?同义句‘( ) （ ） collecting coins 改为同义句My hobby is collecting old coins score 4000 points without collecting coins这个任务是什么意思! collecting coins的中文意思帮帮偶把 Does Liu Tao like collecting coins?（改为肯定句） collecting coins inerests the small boy(用interested改写） Collecting coins interests the small boy.用interested改写 Both Lily and Lucy like collecting coins.(改为同义句)（ ）（ ）Lily（ ）（ ）lucy （ ）collecting coins. Dick is interested in collecting coins.（保持原句意思）Dick is _______ ________ collecting coins. He like collecting coins.(保持原句意思）His ____ is _________ collect coins. coins Collecting coins is one of his hobbies .主谓宾各是哪个,Collecting coins is one of his hobbies .主谓宾各是哪个,这是什么句型? 在Collecting coins ------(cost) time and money中应该用单数还是复数啊?为什么? Jack has been collecting coins since two year ago.（用how long提问.）