情态动词 1
can (could) 1)表示能力,could 主要指过去时间
Two eyes can see more than one
两只眼比一只眼看得清
Could the girl read she went to school
这女孩上学前能识字吗
2)表示可能(理论上或是逻辑判断上)
The temperature can fall to – 60℃ , that is 60℃ below freezing
气温可降至—60℃,也就是零下60℃
He can’ t (couldn’ t) have enough money for a new car
他不可能有足够的钱买新车
You mustn't smoke while you're walking around in the wood
You could start a fire
在林子里走时勿吸烟,那样可能会引起火灾
3)表示允许
Can I have a look at your new pen
我可以看一看你的新钢笔吗
He asked whether he could take the book out of the reading-room
他问他可不可以把书带出阅览室
4)表惊异、怀疑、不相信等态度
主要用于否定句、疑问句或感叹句中
Where can (could) they have gone to
他们会去哪儿了呢
He can’ t (couldn’ t) be over sixty
他不可能超过六十岁
How can you be so careless
你怎么这么粗心
5)比较委婉客气地提出问题或陈述看法
Can (Could) you lend me a hand
帮我一把好吗
I’ m afraid