1.It’suseless doing sth做……无用It’s useless trying to persuade him to give up smoking劝他戒烟没用。It’suseless arguing about the problem with him.与他争论这个问题无用。2….+be/v.+times+n./从句My room is twice the width of Tom’s我的房间是汤姆房问的两倍宽。I prefer to pay three times the price he paid fort hehouse.我宁愿出高于他3倍的价格买这套房子。