★以下是少兒英語(yǔ)頻道為大家整理的《三一口語(yǔ)考試六級(jí)語(yǔ)法學(xué)習(xí)》，供大家參考。更多內(nèi)容請(qǐng)看本站少兒英語(yǔ)頻道。
1. If 引導(dǎo)的條件句---第一條件句
形式：
If I am better tomorrow, I will get up.
If I have a headache, I will take an aspirin.
If she finishes early, she will go home.
用法：
第一類條件句從句中的動(dòng)詞用一般現(xiàn)在時(shí)，主句中的動(dòng)詞用will/shall 動(dòng)詞原形。用來(lái)表示詢問(wèn)或談?wù)撌挚赡艿氖虑?。如果我們認(rèn)為將來(lái)的事件可能會(huì)發(fā)生，就可以用第一條件句去描述將會(huì)發(fā)生什么事或不會(huì)發(fā)生什么事。
2. 過(guò)去進(jìn)行時(shí)
形式：
過(guò)去進(jìn)行時(shí)由was/were -ing 分詞構(gòu)成。
I was writing.
We were writing.
用法：
①表示過(guò)去某時(shí)正在進(jìn)行的動(dòng)作。
What were you doing last night at seven o'clock?
Workers were building a dam last summer.
②與always 連用表示過(guò)去經(jīng)常重復(fù)的動(dòng)作。
He was always changing his mind.
She was always coming back late.
3. 現(xiàn)在完成時(shí)
形式：
現(xiàn)在完成時(shí)是have/has ed分詞構(gòu)成的。
I have (I've) played.
He has (He's) worked.
用法：
①表示動(dòng)作或過(guò)程發(fā)生在說(shuō)話之前某個(gè)沒(méi)有明確說(shuō)出的過(guò)去時(shí)間，現(xiàn)在已經(jīng)完成了，并與現(xiàn)在的情況有聯(lián)系。
現(xiàn)在完成時(shí)可以不帶時(shí)間狀語(yǔ)。
She's turned off the light.(燈在一個(gè)過(guò)去時(shí)間被關(guān)了，說(shuō)話時(shí)刻仍然關(guān)著。)
現(xiàn)在完成時(shí)可以表示最近發(fā)生的動(dòng)作。
She's already gone.
It's rained quite recently.
現(xiàn)在完成時(shí)可以表示反復(fù)性和習(xí)慣性動(dòng)作。
We have often been there.
I've seen the film three times a month.
②表示開(kāi)始于過(guò)去并持續(xù)到現(xiàn)在(也許還會(huì)持續(xù)下去)的動(dòng)作。
現(xiàn)在完成時(shí)和“直到現(xiàn)在”的狀語(yǔ)連用。
Up till now we have planted over 24,000 fruit trees.
So far everything has been successful.
現(xiàn)在完成時(shí)與since 和 for 連用。
I've known him since 1950.
I haven't smoked a cigarette for a year
1. If 引導(dǎo)的條件句---第一條件句
形式：
If I am better tomorrow, I will get up.
If I have a headache, I will take an aspirin.
If she finishes early, she will go home.
用法：
第一類條件句從句中的動(dòng)詞用一般現(xiàn)在時(shí)，主句中的動(dòng)詞用will/shall 動(dòng)詞原形。用來(lái)表示詢問(wèn)或談?wù)撌挚赡艿氖虑?。如果我們認(rèn)為將來(lái)的事件可能會(huì)發(fā)生，就可以用第一條件句去描述將會(huì)發(fā)生什么事或不會(huì)發(fā)生什么事。
2. 過(guò)去進(jìn)行時(shí)
形式：
過(guò)去進(jìn)行時(shí)由was/were -ing 分詞構(gòu)成。
I was writing.
We were writing.
用法：
①表示過(guò)去某時(shí)正在進(jìn)行的動(dòng)作。
What were you doing last night at seven o'clock?
Workers were building a dam last summer.
②與always 連用表示過(guò)去經(jīng)常重復(fù)的動(dòng)作。
He was always changing his mind.
She was always coming back late.
3. 現(xiàn)在完成時(shí)
形式：
現(xiàn)在完成時(shí)是have/has ed分詞構(gòu)成的。
I have (I've) played.
He has (He's) worked.
用法：
①表示動(dòng)作或過(guò)程發(fā)生在說(shuō)話之前某個(gè)沒(méi)有明確說(shuō)出的過(guò)去時(shí)間，現(xiàn)在已經(jīng)完成了，并與現(xiàn)在的情況有聯(lián)系。
現(xiàn)在完成時(shí)可以不帶時(shí)間狀語(yǔ)。
She's turned off the light.(燈在一個(gè)過(guò)去時(shí)間被關(guān)了，說(shuō)話時(shí)刻仍然關(guān)著。)
現(xiàn)在完成時(shí)可以表示最近發(fā)生的動(dòng)作。
She's already gone.
It's rained quite recently.
現(xiàn)在完成時(shí)可以表示反復(fù)性和習(xí)慣性動(dòng)作。
We have often been there.
I've seen the film three times a month.
②表示開(kāi)始于過(guò)去并持續(xù)到現(xiàn)在(也許還會(huì)持續(xù)下去)的動(dòng)作。
現(xiàn)在完成時(shí)和“直到現(xiàn)在”的狀語(yǔ)連用。
Up till now we have planted over 24,000 fruit trees.
So far everything has been successful.
現(xiàn)在完成時(shí)與since 和 for 連用。
I've known him since 1950.
I haven't smoked a cigarette for a year