1. if误］if it will rain i won't go to school tomorrow.［正］if it rains i won't go to school tomorrow.
［析］由if引起的状语从句要用一般时表示将来。
误］i want to know if he comes here tomorrow.［正］i want to know if he will come here tomorrow.
析］if所引起的如果是宾语从句则不能用一般现在时表示将来。
误］i want to know if it will rain tomorrow he will come or not.［正］i want to know if it rains tomorrow he will come or not.
析］这里的if从句是整个宾语从句的条件状语，所以，还应用一般时表示将来。
2. ill
误］he spent many years looking after his ill father.［正］he spent many years looking after his sick father.
析］ill和sick都可以作表语，如：i'm ill (sick).美国英语中常用sick，而英国英语中两者都可用，但ill一般不作定语。
3. in误］in a cold morning, i went to school alone.［正］on a cold morning, i went to school alone.
析］在in the morning或in the afternoon词组中，不论在这两个名词的前或后加任何修饰词，其介词in都要变为on.
误］i will finish it after two days.［正］i will finish it in two days.［析］中文中几天以后可以完成，或几天后来取，在译为英文时都不要用after，而要用in.
如：he will be back in a few days.
4. instead
误］the boy stayed in bed all day instead to go to school.［正］the boy stayed in bed all day instead of going to school.
析］instead of其后要接动名词、名词或代词，而不能用不定式，如：i choose thisbook instead of that one.
误］the beer here is not good, so i drink wine instead of it.［正］the beer here is not good, so i drink wine instead.
析］instead是副词，而instead of是介词短语。如：if you are not free, you may
come another day instead.
5. interest
误］he has a great interest for physics.［正］he has a great interest in physics.
误］he has some interest in many companies.［正］he has some interests in many companies.
析］interest作为“兴趣”讲可用作不可数名词，但作为“利息”“股份”讲时为可数名词。
误］this is an interested book.［正］this is an interesting book.
析］修饰物时应用interesting,如：an interesting film，而讲某人对某事感兴趣时要用过去分词interested，如：i'm interested in this play.
但“他是一个十分有趣的人”。应译为he is an interesting man.所以interesting是“令人感兴趣”之意，而interested则表示某人对某事物感兴趣，多用“be interested in something”这一句型。
6. invent
误］america was invented by christopher columbus in 1492.［正］america was discovered by christopher columbus in 1492.［析］invent意为“发明”即从无到有，如：
compasswasinventedbythechinesepeople.而discover则意为“发现”。
7. it误］that takes me ten years to finish this work.［正］it takes me ten years to finish this work.
析］it在这个句中的语法作用是形式主语，而真正的主语是句子后面的不定式。有的句子要用it作形式主语或形式宾语，如：i think it difficult to learn english well.
8. join
误］did you attend the football club?［正］did you join the football club?
析］join经常用于参加某个团体、政党，并作为其中的一个成员；attend则重点强调出会议、到场，而不一定进行具体活动，如：did you attend the meeting yesterday?而take part in则强调参与某些具体活动或运动，如：
i take part in the football game.
9. just
误］i h**e finished my work just now.
正］i finished my work just now.［析］just now意为“刚才”，所以句中的谓语动词要用过去式。
误］just i won the game.［正］i just won the game.［析］just单独使用时不应放在句首，而应放于①be动词之后，如：
heisjustastudent.②名词与一般动词之间。③用在第一助动词之后，如：
i h**e just returned home.但just与其他词组成词组时，如justnow,justthen,则可用于句首和句尾。如：
justthenhe saw the bus coming.
10. keep
误］she was keeping something to her father.［正］she was keeping something from her father.［析］“对某人隐瞒某事”要用“keep something from somebody”句型。
误］he kept to repeat the word again and again.［正］he kept repeating the word again and again.
析］keep doing something为连续不断地做某事。有时可以与keep on doing something互换。它们的区别在于keepdoingsomething意为该动作一直不停地在进行中，如：
whenthetrain started, she kept w**ing her hand.而keep on doing something则表示该动作可能停顿但却一直在进行中，如：he kept on ****** the same mistakes in grammar.
误］we must keep up the times.
正］we must keep up with the times.［析］这句话意为“我们必须赶上时代”，keep up with是“赶上”之意，而keep up则是“坚持下去”的意思，如：keep it up, don't stop now!
11. key
误］i lost the key of the door.［正］i lost the key to the door.
析］英语中讲某某的东西一般要用of，而key,entrance,answer则多用to，如：“门的钥匙”为key to the door,“高速公路入口”为entrance to the highway,“问题的答案”为the answer (key) to the question.
12. kind
误］this kind of books are not good.［正］this kind of books is not good.
析］kind在这种句式中应作为主语，如果讲those kinds of books are very good.则是正确的。
kind, sort, type
kind和sort为同义词，意为“种类”，而type则为“型号”，如：what type of this cardo you want?（你想要这种车的什么型号？）
13. knock
误］someone was knocking the door.［正］someone was knocking at the door.
析］knock虽可以作及物动词，如：the car knocked a hole in the fence.但作“敲门”讲一定要用作不及物动词：
knock at (on) the door.
14. know
误］i want to know to play this game.［正］i want to know how to play this game.
析］要注意英语中在不定式前加疑问代词或疑问副词的用法。如：iwanttoknowhowtodo it / what to do / when to do it / where to go.
know, know of
i know him.为“我很了解他。”而i know of him.则为“我听说过他。”同样的用法还有hear和hear of这一词组。
15. large
误］he found a large number of mistake in his homework.［正］he found a large number of mistakes in his homework.［析］“a large number of +复数名词”，意为大量的。
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