I jump as far as he does.那我跳的不如他远怎么说！He jumps farther than I do.我要的是否定形式！I can't jump father than he does.你那个意思是我不能，我要的是不如！还有，能不能说have a good time doing？还是只能说have fun doing？那就把can't改成don't。那两个都可以说的