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四級讓步狀語從句語法解析
大學英語四級考試涉及的語法知識點多、涉及面寬，對不少考生來說都是一個難題。以下是小編為大家搜索整理的2017年四級讓步狀語從句語法解析，希望能給大家帶來幫助!更多精彩內容請及時關注我們應屆畢業生考試網!
常見的連接詞有though, although，as, while, even though
區分though，although，as
eg：Although/though he is a child, he can live by himself.
as 表示雖然的時候，要進行倒裝;
Child as/though he is , he can live by himself.
eg：Although/though she works very hard ,she makes very little progress.
Hard as she works, she makes very little progress.
Although/though she is young, she has travelled to many countries to put shows .
Young as she is, she has travelled to many countries to put shows .
while：連接兩個句子，表示雖然，但是;
eg：He is experienced while he is young.
真題分析：
1.The anti-virus agent was not known
(直到一名醫生偶然發現了它)
until a doctor find it by chance.
2.I would prefer shopping online to shopping in a department store because __________(它更加方便和省時)
it is more convenient and timesaving.
3.But since water is much cheaper than wine, and many of the fancier brands aren’t available in stores, most diners don’t notice or care.
4. While there’s no question that continuous stress is harmful, several studies suggest that challenging situations in which you’re able to rise to the occasion can be good for you.
【相關閱讀】
英語四級冠詞語法講義
冠詞分不定冠詞(indefinite article)和定冠詞(definite article)兩種，一般無句子重音。
1)不定冠詞a，an
a) a和an均用在單數名詞之前，表示某一類人或事物中的"一個"，相當于漢語的"一"，但不強調數目觀念。
b) a用在輔音之前，an用在元音之前。如：a notebook一個筆記本，a cigarette一支香煙，an old man一位老人，an English class一堂英語課。
字母u讀作[ju:]時，由于第一個音[j]是輔音，故前面用a，不用an。如：a useful book一本有用的書，a university一所大學。字母h如不發音，第一個音又是元音，前面用an而不用a，如an hour [?n'au?]一小時，an honest [?n' nist] person一個誠實的人。
c) a和an在句中分別弱讀作[E]和[En]。
2)定冠詞the
a)表示某一類人或事物中的"某一個"或"某一些"，相當于漢語的'"這"或"那"。
b)不論單數名詞或復數名詞，也不論可數名詞或不可數名詞，前面都可以用the。
c)在元音前讀[Ti]，輔音前讀[TE]。如the evening [Ti5:vniN] (傍晚)，the car [TEkB:] (汽車);在元音字母u發[ju:]和半元音字母。y發[j]時，仍讀[?TE]。如the unit [TE5ju:nit] (單位)，the yard [TEjB:d] (院子)。
英語中不定冠詞a (an)的用法
1)指一個人、動物或一件事物屬于某一類。如：
Xiao Xu's father is a miner.小徐的父親是礦工。(而不是其他工種)
Give me a ballpen , please.請給我一支圓珠筆。(而不是鋼筆或其他種類)
2)指任何一個人、動物或一件事物。如：
A steel worker makes steel.鋼鐵工人煉鋼。(意即任何一個鋼鐵工人都煉鋼)
A triangle has three angles.三角形有三個角。(意即任何一個三角形都有三個角)
3)指某人或某物，但不具體說明何人或何物。如：
He comes from a firm in Beijing.他來自北京某一家公司。
A young man wants to see you.有個青年人要見你。
A car stopped in front of the gate.一輛汽車停在大門前。
4)不定冠詞還可指"事物的單位"，如"每日"、"每斤"等。如：
Butter is 4 yuan a kilo.黃油四元錢一公斤。
He drove the car at 18 miles an hour.他行車速度為每小時十八英里。
The Chinese Export Commodities Fair is held in Guangzhou twice a year.中國出口商品交易會每年在廣州舉行兩次。
The doctor told him to take the medicine three times a day. 醫生叫他一天吃三次藥。
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