giving doesn't cost much(给予不会花费我们太多)为什么不能写成giving isn't cost much
因为cost是实义动词,意思是:花费。
当谓语动词是实义动词,变否定就在实义动词前面加助动词(do,单三用does或过去式zhidid),再加not,即: Giving doesn't cost much.