情态动词can,may,must,need等的一般疑问句,它们的肯定和否定回答各是...答:can表可能的时候.Where can he be?---He may be in the office.用may回答.can表许可的时候.can i smoke here?--no,you can't .yes ,you can.may i ……?我可以……吗?表许可.yes,you may./no,you may not.must i.和need i .回答一样.肯定回答是yes,you must.否定回答是no,you...
情态动词的用法,can,may,must,need,could,dared答:情态动词有can (could), may (might), must, have to, shall (should, will (would), dare (dared), need (needed), ought to等。 情态动词无人称和数的变化;不能单独使用,必须与其后的动词原形构成谓语 一、 can, could 1) 表示能力(体力、知识、技能)。Can you lift this heavy box...