一、after用作介詞，是“……時(shí)間以后”之意，它通常有兩種用法。

1．表示“從過去某個(gè)時(shí)間算起若干時(shí)間之后”，作時(shí)間狀語(yǔ)，常表示“一段”時(shí)間，此時(shí)應(yīng)用過去時(shí)。如：

Jim came back to China after two years．兩年后Jim回到了中國(guó)。

He went to London after three months．三個(gè)月后他去了倫敦。

2．表示某個(gè)時(shí)間、日期或事件以后，這時(shí)的時(shí)間狀語(yǔ)常表示某一“點(diǎn)”時(shí)間，時(shí)態(tài)可以根據(jù)實(shí)際情況用過去時(shí)或?qū)頃r(shí)。如：

After lunch he went out for a walk．午飯后他出去散步了。

He will be back after four o'clock．他將在四點(diǎn)鐘以后回來。

另外，after還可以表示：

1．位置“在……以后”(但值得注意的是，表位置時(shí)，用behind比用after更普遍)

Shut the door after you．隨手關(guān)門。

2．順序“在……以后”

After you，please! 您先請(qǐng)!(口語(yǔ)，客套話)

3．用作連詞，表示“在……以后”

He went to bed after he finished his homework．完成作業(yè)后，他才上床睡覺。

After what has happened，he won't go．在發(fā)生了這一切后，他不會(huì)去了。

二、in用作介詞，表示“從現(xiàn)在或說話時(shí)刻算起若干時(shí)間以后”，作時(shí)間狀語(yǔ)，常表示“一段”時(shí)間，時(shí)態(tài)常用將來時(shí)。如：

I'll come and see you again in five days．五天后我再來看你。

We'll come back in a few minutes．我們馬上回來。

另外，in還可以表示“在一段時(shí)間內(nèi)”，如：

We have learned 200 English words in the past three years．在剛剛過去的3年里，我們學(xué)了200個(gè)英語(yǔ)單詞。

三、later表示“多少時(shí)間以后”，可與after互換，但需要注意兩者的位置。具體換法如下：

時(shí)間+later→after+時(shí)間

Two years later he graduated from middle school.

He graduated from middle school after two years.

兩年后他中學(xué)畢業(yè)了。

用after，in，later填空：

1．I'm coming back____nve days．

2．_____two hours he went to Beijing.

3．He has visited．many places of interest_____the last two days．

4．A few minutes_____he came back．

5．Rome was not built_____a day．

6．About five days______，hewon the game．

7．You can go to play______you finished your work．

8．What do you do______lunch?

Keys：

1．in 2．After 3． in 4．later 5．in 6．later 7．a(chǎn)fter 8．a(chǎn)fter

責(zé)任編輯／張彩萍mirenr@sina．com