内容正文:
Qian De Jia Zhi
Unit 5 The Value of Money
重 点 语 法
2
原创精品资源学科网独家享有版权,侵权必究!
学科网(北京)股份有限公司
学科网(北京)股份有限公司
学科网(北京)股份有限公司
情态动词和过去将来时
一、情态动词的用法
1. 情态动词can与could
①表示能力
·He can (=He is able to) swim.
他会游泳。
·He can speak English well.
他英语能说得很好。
A. 表示将来的能力,通常用will / shall be able to
·I shall be able to come tomorrow.
明天我能来。
·One day people will be able to go to the moon on holiday.
总有一天人们可以到月球上去度假。
但是,若表示现在决定将来是否有能力做某事,则可用 can,如:
·Can you come to the party tonight?
你今晚能来参加我们的聚会吗?
B. 表示过去的能力
B1. 若泛指过去的能力,可用could
·I could run faster then.
我那时能跑得更快一些。
B2. 若表示过去特定场合做某事的能力,则不能用could,而用was / were able to do sth.,或用managed to do sth.,或用succeeded in doing sth.等
·He studied hard and was able to pass the exam.
他学习很努力,所以考试能及格。
= He studied hard and managed to pass the exam.
= He studied hard and succeeded in passing the exam.
误:She could jump into the sea before the ship was blown up.
船爆炸之前,她跳进了大海。
正:She was able to jump into the sea before the ship was blown up.
C. 对于现在或将来的许可,用can或could均可,但could语气更委