公共英語(yǔ)pets二級語(yǔ)法基礎知識
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延續動(dòng)詞與瞬間動(dòng)詞
1)用于完成時(shí)的區別
延續動(dòng)詞表示經(jīng)驗、經(jīng)歷; 瞬間動(dòng)詞表示行為的結 果，不能與表示段的時(shí)間狀語(yǔ)連用。
He has completed the work. 他已完成了那項工作。 (表結果)
I've known him since then. 我從那時(shí)起就認識他了。(表經(jīng)歷)
2)用于till/until從句的差異
延續動(dòng)詞用于肯定句，表示"做……直到……" 瞬間動(dòng)詞用于否定句，表示"到……，才……"
He didn't come back until ten o'clock.
他到10 點(diǎn)才回來(lái)。
He slept until ten o'clock.
他一直睡到10點(diǎn)。
典型例題
1. You don't need to describe her. I ___ her several times.
A. had met B. have met C. met D. meet
答案B. 首先本題后句強調對現在的影響，我知道她的模樣，你不用描述。再次，several times告知為反復發(fā)生的動(dòng)作，因此用現在完成時(shí)。
2.——I'm sorry to keep you waiting.
——Oh, not at all. I ___ here only a few minutes.
A. have been B. had been C. was D. will be
答案A. 等待的動(dòng)作由過(guò)去開(kāi)始，持續到現在，應用現在完成時(shí)
過(guò)去完成時(shí)
1) 概念：
表示過(guò)去的過(guò)去
其構成是had +過(guò)去分詞構成。
那時(shí)以前 那時(shí) 現在
2) 用法
a.在told, said, knew, heard, thought等動(dòng)詞后的賓語(yǔ)從句。
She said (that) she had never been to Paris.
b. 狀語(yǔ)從句
在過(guò)去不同時(shí)間發(fā)生的兩個(gè)動(dòng)作中，發(fā)生在先，用過(guò)去完成時(shí);發(fā)生在后，用一般過(guò)去時(shí)。
When the police arrived, the thieves had run away.
c. 表示意向的動(dòng)詞，如hope, wish, expect, think, intend, mean, suppose等，用過(guò)去完成時(shí)表示"原本…，未能…"
We had hoped that you would come, but you didn't.
3)過(guò)去完成時(shí)的時(shí)間狀語(yǔ)：
before, by, until , when, after, once, as soon as.
He said that he had learned some English before.
By the time he was twelve, Edison had began to make a living by himself.
Tom was disappointed that most of the guests had left.
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