过去 I drank coffee.
I was drinking coffee when he came in.
They were drinking coffee when I came in.
I had drunk coffee yesterday.
I had been drinking coffee.
现在
I drink coffee.
He drinks coffee.
She drinks coffee.
I'm drinking coffee.
She is drinking coffee.
You are drinking coffee.
We are drinking coffee.
I have drunk coffee.
I have been drinking coffee.
未来
We will drink coffee tomorrow.
We will be drinking coffee.
We will have drunk coffee.
We will have been drinking coffee.
虚拟语气would
We would drink coffee tomorrow.
We would be drinking coffee.
We would have drunk coffee.
We would have been drinking coffee.
虚拟语气should
We should drink coffee tomorrow.
We should be drinking coffee.
We should have drunk coffee.
We should have been drinking coffee.
虚拟语气could
We could drink coffee.
这句话暗示了现在或将来的可能性或建议。
We could be drinking coffee.
这也暗示了一个建议，但将动作置于现在进行时态。 它提出了一种现在可能发生的替代行动。 例如，如果有人感到无聊或正在寻找一些有成效的事情做，他们可能会这么说。
We could have drunk coffee.
这表示过去错过了机会或可能性。 演讲者正在思考哪些事情本来可以做，但没有做。
We could have been drinking coffee.
这句话将过去进行时与假设情况结合起来，表明在过去的某个特定时间里，他们有机会正在做某事，但没有。 它常常带有一种对如何度过时间的遗憾或事后认识的语气。
