［正］ I've been to America once.
［析］ once 多用于肯定句，而ever则用于疑问句，否定句，及条件状语从句中，如：Have you ever been to London?
［误］ - Could you pass the exam this time?
- No, I am not afraid so.
［正］ - Could you pass the exam this time?
- No, I'm afraid not.
［析］ 在肯定的答语中我们可以用so来代替上句所讲的事件，如：Do you think she is a good student? Yes I think so, /I hope so, /I believe so/ I'm afraid so.但在否定的答语中，英语口语的习惯用法则有所不同，如，I don't think so 而在hope, belive 与 afraid后则常用not， 如：I hope not.
［误］ She didn't work enough hard, so she couldn't pass the exam.
［正］ She didn't work hard enough, so she couldn't pass the exam.
［析］ enough 可以作名词用，如：Enough has been said for how to learn English well. (对于如何学好英语已经讲的足够多了。)另外它可以作为形容词，如：I have enough money (or money enough) to buy this dictionary. 注意 enough作为形容词时即可放于名词前又可放于名词后，在初中范围的考题中多用于名词之前。如果enough 作为副词用，那么它一定要放在被修饰的形容词或副词之后。
［误］ You can't be very careful.
［正］ You can't be too careful.
［析］ 此句话的含意是你如何小心也不过分。too…to的用法是太……以至于不能作某事。但在实际应用时也常常将后面的to省去，如：It is too expensive for me.那对我来讲是太贵了。
［误］ He is good past fifty.
［正］ He is well past fifty.
［析］ well 作为副词用时除用于好之外还有大大地、远远地，等意。往往有人对下面两句的对或错有争议；
He is well.
He is good.
其实这两句都是正确的表达法，只不过其含意不同。He is well是他身体不错，而He is good 则为他是个好人。
［误］ She is not as half clever as her brother.
［正］ She is not half as clever as her brother.
［析］ 在as…as结构中要将修饰形容词的数量词倍数及nearly, almost, exactly… 等置于第一个as之前。
［误］ He is same age as Tom.
［正］ He is the same age as Tom.
［析］ the same…as是固定的用法，其中定冠词the是不可省也不能换成别的词的。
［误］ Mother and her daughter are exactly like.
［正］ Mother and her daughter are exactly alike.
* like 作为介词，其意为像，应用于 look like, be like, sound like, 其后要加宾语。而 alike 是形容词，或副词，如: You and I think alike. The twins are dressed alike。 但 alike 仅作表语而不能用于名词前作定语。
［误］ Who is taller of the two?
［正］ Who is the taller of the two?
［析］ 两者的比较级之前要加定冠词。
［误］ I have less books than Tom.
［正］ I have fewer books than Tom.
［析］ less 是 little的比较级，而fewer是few的比较级。less后应加不可数名词而fewer后是可数名词。
［误］ There are three girls in my group. The cleverer is Mary.
［正］ There are three girls in my group. The cleverest is Mary.
［析］ 在两者之间应用比较级，在三者之间或三者以上的范围内应用最高级。
［误］ The boy sat there as quiet as his sister.
［正］ The boy sat there as quietly as his sister.
［析］ as…as的用法要注意的是：①在其中间应加形容词或副词的原级，而不可加比较级，也有的语法书中称为同级比较。②要根据句意决定是加形容词还是副词，这要看它具体是修饰动词还是名词而定，如：He is as good as his friend.
［误］ The harder you study, and you can learn more.
［正］ The harder you study, the more you can learn.
［析］ 英文中如果要表达越来越怎样，在初中范围有两种表达法：①比较级+and+比较级。②定冠词+比较级……，如：The nights are getting longer and longer。 要注意的是多音节形容词的比较级前要加more，这样的用法是：more and more 加形容词，如：The girl is growing more and more beautiful.
［误］ Studying physics is not so interesting as to learn English.
［正］ Studying physics is not so interesting as learning English.
［析］ 在作比较时，英语一般要求对比的两部分结构应一致。如用动名词，应都用动名词，用不定式时则都用不定式。但有时在后一个不定式前的符号to可以省略。如：To repair the old one is as much expensive as (to) buy a new one.
［误］ The girl is more cleverer than the boy.
［正］ The girl is much more clever (much cleverer) than the boy.
［析］ clever有两个比较级：cleverer和more clever,要注意的是不能用比较级来修饰比较级。clever的两个比较级也各有不同之处，如用在两种不同性质的比较时多用more clever,如：He is more clever than honest. (他的聪明要远远超过其诚实。)
［析］ The boy is the tallest to the three.
［正］ The boy is the tallest of the three.
［析］ 最高级的范围要用of加复数形式或加集合名词。
［误］ This book is one of the most useful dictionary.
［正］ This book is one of the most useful dictionaries. …… 此处隐藏：3931字，全部文档内容请下载后查看。喜欢就下载吧 ……
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