初一至初三全程英語知識點總結及練習1
ⅲ. hardly… when…的主句通常 用過去完成時，從句用一般過去時，when有時還可換成before.如：
① he had hardly finished his homework when the light went out. 他剛寫完作業燈就滅了。
② hardly had i come back when they began quarrelling.我一回來他們就開始吵了起來。（hardly 提前時，句子需要倒裝。）
ⅳ. no sooner…than…句型中， no sooner一般只置于句首，所以主句有倒裝形式。如：
no sooner had i known the news than i telephoned my mother. 我剛知道這個消息就打電話告訴了媽媽。
§48 as well as/ as well
ⅰ. as well as “也”“不僅…而且”意同：not only … but also具有連詞性。
① she is my friend as well as my doctor. 他不僅是我的醫生，也是我的朋友。
② small towns as well as big cities are being industrialized. 小城市與大城市一樣都在迅速實現工業化。
ⅱ. as well “也”具有副詞性。大致相當于also 或 too . 如：
he can speak chinese as well.
§49 as/ because/ for/ since
ⅰ. 這三個詞都可以用作連詞，表“原因、理由” 但有區別：
ⅱ. as “因為、既然”表示的原因或理由是明顯的。語意不如because強。當理由是明顯的，或者被認為是已知的時，則以用as 為好。如：
① as he was not well, i decided to go without him. 因為他身體不好，我決定獨自去了。
② as it was getting very late, we soon turned back. 因為已很晚了， 我們很快就回來了。
③ as it is raining, you’d better take a taxi. 既然在下雨，你最好乘出租車。
ⅲ. because “因為”表直接而明確的原因或理由。即必然的困果關系。在這幾個詞中，它的語意最強�；卮鹨詗hy 引導的特殊疑問句時，只能用because . 注意：because 不可以與so 連用。如：
① he had to stay at home yesterday because he was ill.昨天他只得呆在家里，因為他病了。
② i did it because they asked me to do it. 我之所以做這件事，是因為他請我做的。
③ ---why can’t you do it now? --- because i’m too busy.
ⅳ. since“既然”比as 較為正式，說明為人所知的原因。語氣比because 稍弱。
① since light travels faster than sound, we see lightening before we hear the thunder.因為光比聲音傳播得快，所以我們先看到閃電，后聽到雷聲。
② since he can’t answer the question, you’d better ask someone.既然他回答不了這個問題，你最好問別人吧。
③ since you are busy, i’ll do it for you.既然你忙，我替你做吧。
ⅴ. for “因為”表原因或理由時，用以說明理由，只是解釋性的。在這幾個詞中，它的語意最弱。它少用于口語中，也不用于句首。如：
① i asked her to stay to tea, for i had something to tell her. 我請她留下來喝茶，因為我有事要告訴她。
② we must get rid of carelessness, for it often leads to errors. 我們一定克服粗枝大葉的毛病，因為粗枝大葉常常差錯。