【正文】 difficulty in waking him up. 4． Although/Though regular exercise is very important， it’ s never a good idea to exercise too close to bedtime. 5． While/Though/Although all of them are strong candidates， only one will be chosen for the post. 6． We’ ll make a trip even if/though the weather is bad. ◆ 原因狀語從句： because， for， as， since， now that 1． 表示不知道的原因時用 because， 即說話人認為聽話人不知道 ， 因此 because 從句是全句最重要的部分 ， 通常它被置于主句之后 。書面表達 ) Usually， no matter how far away or how busy we are， we will try to return home for the celebration. 3． 盡管我很累 ， 但我從沒感到這樣快樂過 。陜西 如果不是因果關系 ， 而是對前面主句的內容加以解釋或推斷時 ， 只能用 for。 3． as， when， while 用法一覽表 。 在并列句中 ， 這些簡單句常由并列連詞連在一起 。 It was raining when we arrived.(指時間點 ) When we were at school， we went to the library every day.(在一段時間內 ) while while 意思是 “ 當 ?? 的時候 ” 或 “ 在某一段時間里 ” 。 since 要比 as 正式一些 ， 它們通常被置于語句之前 ，但有時卻相反 。湖南 書面表達 ) When some fell behind， others would e and offer help. 2． 通常無論我們離得多遠或多忙 ， 我們都會盡量回家過節(jié) 。 though 引導的從句也可以倒裝 ， 但 although 引導的不可以 。 We were having a meeting when someone broke in. We were about to set off when it suddenly began to rain. (6)while 作為并列連詞 ， 意為 “ 而 ， 卻 ” ， 表示對比 。 Jane said she was ill， yet I saw her in the street just now. Some of the studies show positive results， whereas others do not. (4)表示因果關系 ： 常用的并列連詞有 so， for 等 。 I’ ll get there even if/though I have to sell my house to get enough money to go by air. 3． no matter 后接上 who， what， where， how 等疑問詞引導讓步狀語從句 ， 也可以在這類疑問詞后面加上 ever 構成 whoever， whatever， wherever， however 等 。 If necessary， I will go there. 題組訓練 4 語法填空 1． The police officers in our city work hard in order that/so that the rest of us can live a safe life. 2． She worked hard so that everything would be ready in time. 3． H