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although和while都是連詞，都可引導(dǎo)讓步狀語從句，但在用法上有很大區(qū)別。
although為從屬連詞，引導(dǎo)讓步狀語從句，意為“雖然，盡管”，相當(dāng)于though，所引導(dǎo)的句子通常置于句首.
Although it was only four o‘clock，the lights were already on. 盡管才四點(diǎn)，燈卻已經(jīng)亮了
Although he is still young his hair is grey. 雖然他還很年輕，但頭發(fā)已經(jīng)灰白一雙
while意為“然而，但是”，用作并列連詞，表示前后的對(duì)比，所引導(dǎo)的句子不能置于句首
Jack likes football，while his brother likes basketball.. 杰克喜歡足球，而他的弟弟卻喜歡藍(lán)球.
[注意] while也可用作從屬連詞，引導(dǎo)讓步狀語從句，意為“雖然，但是”，可和although換用
While/Although we don‘t agree，we continue to be friends.
盡管我們意見不同，但我們還是朋友
While/Although it was so cold，he went out without an overeoat.雖然天氣很冷，但他沒有穿大衣就出去了．
7. unfortunate adj.不幸的 adv．不幸地，不幸運(yùn)地
I would like to apologize for this unfortunate mistake. 我謹(jǐn)就此令人遺憾的錯(cuò)誤致歉。
She was unfortunate to miss the last train. 她不幸錯(cuò)過了最后一班列車
Unfortunately，he didn‘t pass the exam. 不幸的是，他沒有通過考試．
8. share v.＆n
(1)v. ＂分享，分擔(dān)，分配”，常用句式：share sth. with sb
Would you share your newspaper with me‘? 我們一起看報(bào)紙好嗎？
Why didn‘t we share the expenses among us? 我們?yōu)楹尾灰黄鸱謸?dān)費(fèi)用呢？
I share a flat with four other people. 我和其他4人共用一個(gè)公寓
Let‘s share the pizza beticeen the two of us. 我們倆來分享這個(gè)比薩餅吧
His property was shared equally among his children. 他的財(cái)產(chǎn)被他的子女平分了.
(2) n. 一份，份額
I‘ve not got my share of the cake yet. 我還沒分得我的那份蛋糕．
9. mean v.
（l）mean做動(dòng)詞，意思是“意味著…；有……的意思”，后常接名詞或v.ing形式作賓語
What do you mean by saying so? 你這么說是什么意思？
What he said meant hiring some more workers. 他的意思是再雇一些工人
