題目：

1、holiday vacation time off days off之間的區(qū)別2、 while when as soon as 的用法,有規(guī)定的時態(tài)嗎?

解答：

Holiday:1a period when you are not at work of in school 假期,你不在工作或?qū)W校 2.a period when you are traveling or resting 度假期,休息的時間. 在美國英語里,vacation 和第二個意思相同.但基本沒什么區(qū)別time offph.1. 請假,休假day off1. 休息日She took a day off.她請了一天假when, while ,as soon as 這三個詞都有"當(dāng)……時候"之意,但用法有所不同,使用時要特別注意. ①when意為"在……時刻或時期",它可兼指"時間點"與"時間段",所引導(dǎo)的從句的動詞既可以是終止性動詞,也可是持續(xù)性動詞.如： When I got home, he was having supper.我到家時,他正在吃飯. When I was young, I liked dancing.我年輕時喜歡跳舞. ②while只指"時間段",不指"時間點",從句的動詞只限于持續(xù)性動詞.如： While I slept, a thief broke in.在我睡覺時,盜賊闖了進來. 辨析 ①when從句與主句動作先后發(fā)生時,不能與while互換.如： When he has finished his work, he takes a short rest.每當(dāng)他做完工作后,總要稍稍休息一下.(when = after) When I got to the cinema, the film had already begun.當(dāng)我到電影院時,電影已經(jīng)開始了.(when=before) ②when從句動詞為終止性動詞時,不能由while替換.如： When he came yesterday, we were playing basketball.昨天他來時,我們正在打籃球. ③當(dāng)從句的謂語是表動作的延續(xù)性動詞時,when, while才有可能互相替代.如： While / When we were still laughing, the teacher came in.正當(dāng)我們?nèi)栽诖舐曟倚r,老師進來了. ④當(dāng)從句的謂語動詞是終止性動詞,而且主句的謂語動詞也是終止性動詞時,when可和as通用,而且用as比用when在時間上更為緊湊,有"正當(dāng)這時"的含義.如： He came just as (or when) I reached the door.我剛到門那兒,他就來了. ⑤從句的謂語動詞如表示狀態(tài)時,通常用while.如： We must strike while the iron is hot.我們應(yīng)該趁熱打鐵. ⑥while和when都可以用作并列連詞. Mike is tall while his brother is short.邁克的個子很高,然而他弟弟很矮. Mary was on her way home when two big boys stopped her.瑪麗正走在回家的路上,這時兩個大個子男孩攔住她. as soon as的用法： （1）、as soon as one can = as soon as possible 表示“盡可能快”之意,如： ① You must ring me up as soon as you can. 你必須盡快給我打電話. ② Please write to me as soon as possible. 請盡早給我寫信. （2）、as soon as 引導(dǎo)時間狀語從句,表示“一……就……”.如果主句用將來時或情態(tài)動詞或祈使句,從句必須用一般現(xiàn)在時代替將來時.如： I’ll tell him the news as soon as he comes. 他一來我就告訴他那消息. She may come as soon as she finishes the work. 事情一做完她就可以來.