could的原形是can。can可以用作情态动词、名词、动词，作情态动词时意为“能；能够；有机会；可能；被允许”。作名词时意为“圆柱形金属容器；罐头；一听所装的量；监狱；卫生间；臀部；驱逐舰；破坏者。作动词时意为“把（食物）装罐保存；（非正式）解雇；拒绝接受”。
一、can词性变化
第三人称单数： cans
复数： cans
现在分词： canning
过去式： could
二、can词语搭配
Can think 能想
Can get 能拿到
Money can 钱能
Can think 能想
Can get 能拿到
Money can 钱能
tin can 罐头
beverage can 易拉罐
三、can双语例句
1.We can reduce the problem to two main issues.
我们可以将这个问题概括成两个要点。
2.I could come next week, or the week after.
我可能下周来，或者再下一周。
3.They think I can't do it, but I'll show them!
他们以为我做不了，我却要做给他们看看！
4.He'll just have to learn he can't always have his own way.
他一定要明白不能老是随心所欲。
5.It was recognized that this solution could only be temporary.
人们意识到这只是个临时的解决方案。
6.I never realized you could be so calculating
我真没有想到你会这样有心计。
