① It happened two days ago.這件事發生在兩天以前。

　　② I met him a few minutes ago.我在幾分鐘以前碰到他。

　　Ⅱ. before adv, prep & conj “……以前”指從那時起若干時間以前。通常與完成時、過去時等連用。還可用作前置詞或連接詞表時間，而ago則不能這樣用。

　　① He said that he had seen her two days before.他說他兩天前見到過她。(表從她說話那時起兩天前)

　　② I had been fine the day before.(那天)前一天的天氣很好。

　　③ I’ve seen that film before.

　　④ I never met him before.

　　中考英語常考詞組辨析：afraid/fear/frightened

　　Ⅰ. afraid “害怕”是形容詞，只能作表語，而不能作定語，后接of 短語或不定式，構成be afraid of sb. 和be afraid to do sth

　　① She is afraid of a snake. 她害怕蛇。

　　② The little girl is afraid to go out at night.

　　afraid +that clause “恐怕”，是婉轉拒絕別人的一種表達方式。如：

　　① I’m afraid (that) I can’t go to the party. My brother is sick. 恐怕我不能去參加聚會了。我弟弟病了。

　　Ⅱ. fear “害怕”是動詞，與be afraid 往往通用，但不如它常用(特別是在口語中)。如：

　　① We fear no difficulty.我們不怕困難。

　　② He feared to speak his mind.他不敢說出自己的想法。

　　③ Fearing that he would catch cold, I went out to see him.因為怕他會受涼，我走去看他。

　　Ⅲ. frightened adj “受驚嚇的、害怕的”可做表語，也可作定語。如：

　　① She is too frightened to move.她太害怕了不能動彈。

　　② A frightened girl is crying. 一個受驚的女孩正在哭。

　　中考英語常考詞組辨析：after/behind

　　Ⅰ. after “在……(時間)之后”;

　　“在……(地點)之后”，指次序。如：

　　① He came after ten o’clock. 他十點以后來的。

　　② Two days after his arrival, I called on him. 在他到達兩天以后，我拜訪了他。

　　③ ‘Against’ comes after ‘again’ in this cictionary.在這本字典中‘against’ 排在‘again’ 之后。

　　Ⅱ. behind 表地點時意為：在……后面、著重指位置的前后。偶爾也指時間，表按照一定的時刻而遲了的意思。

　　① The garden is behind the house.

　　② He stood behind me.

　　③ The train was behind time. 火車誤點了。

　　④ You are two hours behind. 你遲了兩個小時。