高二英語教材知識點總結及重難點解析Unit19-20
(4) on + 動名詞 (或表示動作的名詞)歸納：動名詞(或名詞)結構表示它所表達的動作剛一發生或完成，句子謂語所表示的動作就接著發生。它相當于as soon as 引導的時間狀語從句。on arriving in england, they were taken to the crystal palace by train. 他們一到英國便乘火車去水晶宮。he was greeted by the prime minister on his arrival at the airport. 他一到機場，便受到總理的歡迎。
另外，each time，every time 如同上面四種類型一樣，可直接用作從屬連詞，引導狀語從句。every time i listen to his advice, i get into trouble. 我每次聽了他的勸告，都會遇到麻煩。i'll think of my hometown each time i listen to that song. 我每次聽這首歌，都會想起家鄉。
3. as...as... 與比較級的用法
(1) ...as + 形容詞(副詞)原級 + as...；not as / so + 形容詞 (副詞) 原級 + as... i study as hard as you. 我學習和你一樣努力。he doesn't get up as / so early as his parents.他起床沒有他父母親早。
(2)……倍數 + as + 形容詞(副詞)原級 + as... line ab is 3 times as long as line cd. = line ab is twice longer than / 3 times the length of line cd. 線段ab是線段cd的三倍長。
(3) as + 形容詞 + a / an + 單數可數名詞 + as；as + 形容詞 + 復數名詞 + as i haven't got as much money as i thought. 我的錢沒有我想像的那么多。
(4) as much / many as 多達……，……那么多this factory produces as much as 100 tons of steel a day. 這家工廠每天產鐵 100 噸。as many as 700 different languages are spoken in africa. 在非洲人們所說的語言多達700多種。
5. x times + n. 通過結構，應掌握英語里表示倍數的表達句型。
a is x times the size (height, length, width...) of b.
a is x times as big (high, long, wide...) as b.
a is x times + adj.-er than b.
the size (height, length, width...) of a is x times that of b.
the meeting-room is three times the size of our office. = the size of the meeting-room is three times that of our office.
三倍以下通常用double或者twice來表達兩倍。his weight is double what it was ten years ago. / this railway is twice longer than that one. / the room is twice the size of that one. = this room is twice as big as that one.
☆句型歸納☆
【考點1】as far as i know... 據我所知……
as far as是連詞，本意為“和……一樣遠”。引申意為“就 ……(程度，范圍) 而言，至于，盡……”。類似的還有：as long as“和……一樣長”。“只要”；as good as“和……一樣好”。“實際上，事實上，和……幾乎一樣”；as well as “和……一樣好”，“既……又……，不但……而且……”。例如：as far as i know, he isn't coming to the party. 就我所知，他不會來參加這次聚會。as far as he is concerned, he can't afford such an expensive car. 就他而青，他買不起這么貴的汽車。
【考例1】(北京、安徽) ____ i can see, there is only one possible way to keep away from the danger.