几组词的比较1) ago与 before ago表示以现在为起点的“以前”；before指以过去或将来的某时刻“以前”泛指“以前”，用 before而不用 ago。 I started working in the school three years ago Last year he left the army that he had joined eighteen years before We (have) never met them before (没有具体时间，两种时态都可以)2) very与 much very修饰形容词或副词的原级，much修饰形容词或副词的比较级，修饰动词要用 much或 very much例如： very good，very well；much better I like this film very much very修饰用作形容词的现在分词例如： very interesting，very，exciting，very satisfying等 very修饰某些习惯上已被用作形容词(不管是作表语还是作定语)的过去分词例如： a very pleased look，a very delighted boy， He is very tiredMy English is very limited 这类词有：frightened，disappointed，satisfied，excited，interested，pleased，surprised，troubled，upset，worried等但若用在 by句中，就该用much来修饰 much可以修饰动词，very则不能修饰动词时应注意 much或 very much的位置例如： I enjoyed the concert (very) much I (very) much enjoyed the concert 在英国，只能用作表语的某些形容词例如：alive，alone，afraid，ashamed等前用 much或 very much来修饰，但在美国，往往用 very，如“ very afraid” 在不能确定的时候，用 much往往比 very妥当。3) already，yet，still already表示某事已经发生；yet表示期待某事发生；still表示某事还在进行，主要用于肯定句例如： Hes already finished his work He hasnt finished his work yet Are you still learning French? already和yet可用于疑问句，但含义不同 Have you met Mr. Wang yet? (= up to this moment) 你(到目前为止)见过王先生没有?(一般性问句) Have you already (= sooner than expected) met Mr. Wang? 你(竟然)已经见到过王先生了吗?(表示出乎意料)4) too；also，either too和 also用于肯定句，too多用于口语，also多用于书面语，either用于否定句 You like to play football I like to play football too( I also like to play football) I dont like to play football，and I dont like to play basketball either.5) so that与 such. that so that和 such that都作“如此以致”解，that引导结果状语从句常见句型如下 so + 形容词 / 副词 + that such + a an + (形容词) 单数可数名词 / (形容词) + 复数可数名词 /(形容词)十不可数名词 + that such that和 so that有时可以换用，条件是 such所修饰的名词必须是一个单数可数名词，且该名词前还带有表性质的形容词转变公式如下： such aan 十形容词十名词 so 十形容词十 aan十名词例： He is such a good student that we all like him He is so good a student that we all like him. 但是如果是不可数名词或复数可数名词，则只能用 such而不能用 so修饰如： It was such bad weather that he had to stay at home. 如果复数名词前有 many、few，不可数名词前有 much、little等表示量的形容词时，该用 so而不用 such如： Ive had so many falls that Im black and blue all over Mr. White got so little money a month that he could hardly keep body and soul together 但 little不表示数量而表示“小”的意思时,仍用 such如： They are such little children that they cannot clean the house by them-selves