过去 I read the book.
I was reading the book when he came in.
They were reading the book when I came in.
I had read the book yesterday.
I had been reading the book.
现在
I read the book.
He reads the book.
She reads the book.
I'm reading the book.
She is reading the book.
You are reading the book.
We are reading the book.
I have read the book.
I have been reading the book.
未来
We will read the book tomorrow.
We will be reading the book.
We will have read the book.
We will have been reading the book.
虚拟语气would
We would read the book tomorrow.
We would be reading the book.
We would have read the book.
We would have been reading the book.
虚拟语气should
We should read the book tomorrow.
We should be reading the book.
We should have read the book.
We should have been reading the book.
虚拟语气could
We could read the book.
这句话暗示了现在或将来的可能性或建议。
We could be reading the book.
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 read the book.
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 reading the book.
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。
