It is hard for an old man to work as long as a youngster 这里work 不用加s么为什么呢?

it is very hard for it is hard for me (finish)the nespaper in half an hour(=@__@=) it is ____(not easy,hard)for me to finish half an hour It is hard for me同义句 It is hard for him to think for himselfxie It is it is raining hard that they can't go out for an outingA,as B.since C .fo r D .beacuse it is hard for me to find him .句子结构 hard for 是什么? it is hard for me to give up It is still sick!Really hard for me ah! It is very_____(hard) for you to do that. It is hard to adapt this story for children it is too hard for chinese students () english well It is the most important for you to study hard . it is probably hard for sb to do sth 连词成句hard,me,to,it,is,for,dance It is hard for us __(exercise)every day It is hard for us __(exercise)every day.why? 连词成句hard,me,to,it,is,for,dance