could和can都是情态动词,后面接动词原形,can do something表示现在的能力,could do something表示过去的能力。情态动词表语气,can表示一种自己非常强的自信的语气,could表示一种悔恨遗憾的语气。
相关介绍:
could的例句:
I could come next week,or the week after.
我可能下周来,或者再下一周。
The operation could prolong his life by two or three years.
这次手术可使他多活两三年。
Events could have developed in a dramatically different way.
事情本来可以发展成另一种样子。
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