1)have +過(guò)去分詞,構(gòu)成完成時(shí)態(tài),例如:
He has left for London. 他已去了倫敦。
By the end of last month, they had finished half of their work.
上月末為止,他們已經(jīng)完成工作的一半。
2)have + been +現(xiàn)在分詞,構(gòu)成完成進(jìn)行時(shí),例如:
I have been studying English for ten years.
我一直在學(xué)英語(yǔ),已達(dá)十年之久。
3)have+been +過(guò)去分詞,構(gòu)成完成式被動(dòng)語(yǔ)態(tài),例如:
English has been taught in China for many years.
中國(guó)教英語(yǔ)已經(jīng)多年。
助動(dòng)詞be的用法
1) be +現(xiàn)在分詞,構(gòu)成進(jìn)行時(shí)態(tài),例如:
They are having a meeting. 他們正在開(kāi)會(huì)。
English is becoming more and more important. 英語(yǔ)現(xiàn)在越來(lái)越重要。
2) be + 過(guò)去分詞,構(gòu)成被動(dòng)語(yǔ)態(tài),例如:
The window was broken by Tom.. 窗戶(hù)是湯姆打碎的。
English is taught throughout the world. 世界各地都教英語(yǔ)。
3) be + 動(dòng)詞不定式,可表示下列內(nèi)容:
a. 表示最近、未來(lái)的計(jì)劃或安排,例如:
He is to go to New York next week.. 他下周要去紐約。
We are to teach the freshpersons. 我們要教新生。
說(shuō)明: 這種用法也可以說(shuō)成是一種將來(lái)時(shí)態(tài)表達(dá)法。
b. 表示命令,例如:
You are to explain this. 對(duì)此你要做出解釋。
He is to come to the office this afternoon. 要他今天下午來(lái)辦公室。
c. 征求意見(jiàn),例如:
How am I to answer him? 我該怎樣答復(fù)他?
Who is to go there? 誰(shuí)該去那兒呢?
d. 表示相約、商定,例如:
We are to meet at the school gate at seven tomorrow morning. 我們明天早晨7點(diǎn)在校門(mén)口集合。
He has left for London. 他已去了倫敦。
By the end of last month, they had finished half of their work.
上月末為止,他們已經(jīng)完成工作的一半。
2)have + been +現(xiàn)在分詞,構(gòu)成完成進(jìn)行時(shí),例如:
I have been studying English for ten years.
我一直在學(xué)英語(yǔ),已達(dá)十年之久。
3)have+been +過(guò)去分詞,構(gòu)成完成式被動(dòng)語(yǔ)態(tài),例如:
English has been taught in China for many years.
中國(guó)教英語(yǔ)已經(jīng)多年。
助動(dòng)詞be的用法
1) be +現(xiàn)在分詞,構(gòu)成進(jìn)行時(shí)態(tài),例如:
They are having a meeting. 他們正在開(kāi)會(huì)。
English is becoming more and more important. 英語(yǔ)現(xiàn)在越來(lái)越重要。
2) be + 過(guò)去分詞,構(gòu)成被動(dòng)語(yǔ)態(tài),例如:
The window was broken by Tom.. 窗戶(hù)是湯姆打碎的。
English is taught throughout the world. 世界各地都教英語(yǔ)。
3) be + 動(dòng)詞不定式,可表示下列內(nèi)容:
a. 表示最近、未來(lái)的計(jì)劃或安排,例如:
He is to go to New York next week.. 他下周要去紐約。
We are to teach the freshpersons. 我們要教新生。
說(shuō)明: 這種用法也可以說(shuō)成是一種將來(lái)時(shí)態(tài)表達(dá)法。
b. 表示命令,例如:
You are to explain this. 對(duì)此你要做出解釋。
He is to come to the office this afternoon. 要他今天下午來(lái)辦公室。
c. 征求意見(jiàn),例如:
How am I to answer him? 我該怎樣答復(fù)他?
Who is to go there? 誰(shuí)該去那兒呢?
d. 表示相約、商定,例如:
We are to meet at the school gate at seven tomorrow morning. 我們明天早晨7點(diǎn)在校門(mén)口集合。