【句子】

Long before children are able to speak or understand a language, they communicate through facial expressions and by making noises.
兒童在能說或能聽懂語言之前，很久就會(huì)通過面部表情和靠發(fā)出噪聲來與人交流了。

【解析】

long 和long before 的區(qū)別:

before long 不久以后，很快;long before 很久以前

①They came back before long.
他們很快就回來了。

②I knew Tom long before I knew you.
我在認(rèn)識(shí)你之前很久就認(rèn)識(shí)了湯姆。

able to與can的區(qū)別：

1)be able to 強(qiáng)調(diào)通過努力而獲得的能力，而can則強(qiáng)調(diào)自身已具有的能力。

①She can sing the song in English.
她能用英語唱這首歌。

②He will be able to sing this song in English in a few minutes, too.
幾小時(shí)之后，他也能用英語唱這首歌。

2)be able to 強(qiáng)調(diào)一種結(jié)果，而can只強(qiáng)調(diào)一種可能。

①Luckily, he was able to escape from the big fire in the end.
幸運(yùn)的是，他終于逃出了大火。

②If he got here a few hours earlier, I could save him.
要是他早幾小時(shí)來，我還能救他。

3)be able to 可以有各種時(shí)態(tài)；而can只有一般現(xiàn)在和一般過去兩種時(shí)態(tài)。

①He is / was / will be able to help you.
他能幫你的忙。

②I could help you last night, but you didn’t come.
昨天晚上我能幫你，而你又沒來。

4) can可用于表示可能性，推測(cè)，允許等情況，而be able to通常不這樣用。

①You are able to use my pen. (誤)
②You can use my pen. (正)

5)can有被動(dòng)語態(tài)，主語為人或物皆可，而be able to只接不定式的主動(dòng)形式，不接表示被動(dòng)的不定式，也不可用無生命的名詞作主語。

①The work is able to be done by him. （誤）
②He is able to do the work.（正）

注意：指過去某時(shí)或某個(gè)時(shí)刻設(shè)法做成某事，不用could,而用was\were able to。

I talked with her for a long time,and eventually I was able to make her believe me.
我談了很久，最終還是使她相信了我的話。

3.facial n.面部護(hù)理；美容 a.面部的

①She is having a facial massage.
她正做臉部按摩。

②I've made an appointment for a facial next week.
我已經(jīng)預(yù)約了下周去美容。

4.expression n. 表情，表示，表達(dá)，詞句，措辭，表現(xiàn)

【近義詞】

face n.表面,臉;v.面對(duì),面向 ? ? ? ? ?look v.看,尋找;n.看,樣子
manifestation n.表現(xiàn),示威運(yùn)動(dòng) ? ?saying n. 諺語,俗話;動(dòng)詞
communication n.交流,通訊 ? ? ? ?appearance n.出現(xiàn),露面
countenance n.面容,面部表情;v.贊.. phrase n.短語,習(xí)語;vt.措詞...
idiom n.成語,慣用語 ? ? ? ? ? ? ? ? ?term n.學(xué)期,術(shù)語;vt.把 ...

①He had a passive expression on his face.
他臉上有一種漠然的表情。

②The scenery was beautiful beyond expression.
那風(fēng)景美麗得無法形容。?

【練習(xí)】

The fire spread through the hotel very quickly but everyone ______?get out．(NMET’97)
A had to ?B would ?C could ?D was able to

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