英语考点分析之【动词时态】

1 ．过去完成时，主要表示过去某一时刻前发生的动作或状态，常和after，before, by引入的状语连用。例如：Before John got home, his daughter had already gone to bed．过去完成时不同于一般过去时，强调过去的过去，显示过去发生的几个动作的先后。而一般过去时仅仅是叙述发生于过去某一时刻的动作，不强调时间的先后顺序。例如：When she got home, her husband had already prepared the dinner.（强调她回家前饭已做好。）／When she got home, she saw letter on her desk.（强调回家后看到桌上有封信。）

2 ．将来完成时，主要表示将来某一时刻之前已经完成或已经发生的事情，常和由by引起的时间状语一起使用。例如：By the end of next month, he will have been here for ten years.

3 ．现在完成进行时，表示现在某一时刻之前一直在进行着的动作，这个动作可能已经完成，也可能仍在进行。例如：1 have been working on my composition all morning．与现在完成时相比，现在完成进行时更强调动作的延续性。例如：She has done her homework.（表示她已经做完了。）/She has been doing her homework. （强调她一直在做作业。） 有些延续性动词，例如：live, study ,teach , work等，其现在完成时与现在完成进行时的区别不大，都表示延续一段时间的动作。

【题型解析】

1 . It is expected that the new highway ____ completed by next July.

A. would be B. has been C. will have been D . had been

（选C。考查将来完成时。）

2. By the end of last week, all students______from their holidays.

A. had returned B．would return C. returned D. was returning

（选A。考查过去完成时。）

3. She____in the elementary school since she graduated from college in 1990.

A. taught B. was teaching C. has been teaching D. has taught

（选C。考查现在完成进行时。）

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