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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