There had been 25 parks in our city up till 2009.
By the end of last term we had finished the book.
They finished earlier than we had expected.
考点一：用于hardly/scarcely...when; no sooner ...than句型中，主句用过去完成时，从句用一般过去时。
I had hardly finished my work when he came to see me.
I had no sooner got the room than it began to snow.
No sooner had I arrived home than the telephone rang. (注意倒装)
That was the second time that she had seen her grandfather.
考点三：动词hope, expect, think, intend, mean, want, suppose, plan 用过去完成时，表示未实现的愿望、打算和意图。
I had hoped that I could do the job. I had intended to see you but I was too busy.
表示在将来某个时间发生的动作或情况。常和tomorrow, next year, in 2008等表示将来的时间状语连用，其表现形式多达5种。
We will begin our class as soon as the teacher comes.
考点二：某些表示短暂性动作的动词如arrive, come, go, leave, start等，用现在进行时形式表示将来。
I am leaving for Beijing tomorrow.
考点三：“祈使句 + and / or + 句子”，这种结构中and后面的句子谓语用一般将来时。
Use your head and you will find a way.
考点四：“be going to + 动词原形”，表示打算要做的事或可能要发生的事。
“be about to + 动词原形”表示按照预定计划或打算准备着手进行的动作。
“be to + 动词原形”表示必须、必然或计划将要做的事。
They are to be married in May.