1. He gave me a very good advice yesterday.
句中的a要去掉，因为advice是不可数名词。一些汉语概念为可数的词在英语中却是不可数的，表示数量时在其前加a piece of，类似的词有：news, bread, work, paper, chalk, furniture, information等等。
2. That girl loves reading book.
可数名词单数不能孤零零地放在句子里，或前面加冠词，或将其变为复数。此处最好变为books.
3. He went into a book’s shop and bought a dictionary.
一般表示有生命的东西的名词的所有格用's，如my mother's car, 而此处适宜用名词修饰名词，改为a book shop.
4. My family is watching TV.
一些集合名词如看成一个整体，则用单数的谓语动词，如My family is a happy one; 如强调集合中每个个体的个人行为，则用复数的谓语动词。此处看电视是个体行为，应把is改为are。类似的词有：team, class, audience等。
5. I bought some potatos and tomatos at the supermarket.
中学阶段以“o”结尾的名词中有四个词变复数时要加es，它们是tomato, potato, Negro, hero; 其余的都加s变为复数。
6．This has nothing to do with their believes.（这和他们的信仰没关系。）
以f, fe 结尾的词变为复数时一般去f, fe 加ves，如knife—knives, thief—thieves; 而roof 和belief直接加s变为复数。所以应把believes改为beliefs.
7. The boss wants to hire an useful person.
用a还是an，取决于后面单词的第一个音标，如为元音用an，为辅音用a。useful的第一个音是辅音所以应把an改为a。类似的，我们说a European country.
8．Plane is a machine that can fly.
Plane为可数名词单数，不能单独放在句中，应在其前加冠词或把它变为复数，而本句后有a machine, 因此只能在其前面加a，变为A plane。
9．He played a piano at the party yesterday.
把a 改为the ，因为乐器前用定冠词。
10．The machine was invented in 1920s.
在in后加the，因为表示年代用in加the再加几十的复数，如在八十年代in the 80s。
11．Xiao Hong went to school by the bus every day.
去掉the，因为表示交通方式用by直接加交通工具。
使用代词时请注意其单、复数，主、宾格以及形容词性物主代词和名词性物主代词的用法。
12．He is one of those speakers who make his ideas perfectly clear.
定语从句的先行词是those speakers，为复数，因此从句中的指示代词应为复数，应把his改为their。
13． Whom do you think has left the lights on？
放在疑问句特殊疑问词后的do you think / believe / guess / imagine / suppose等都不参与句子成分，把它们去掉后，疑问词在句中做主语用主格，做宾语用宾格。本句中去掉do you think后缺的是主语，应把Whom改为Who。
14．The boss pretended not to see John and I.
John和I在句中都做的宾语，应把I 改为me。
15．These books are mine; those in the bag are her.
Her是形容词性物主代词，后面应该加名词books，或把her 改为hers。
16．There are fourteen hundreds students in our school.
Hundred / thousand / million / score/ dozen等词前有具体数字时后不加s，前面没有具体数字时在其后加s 和of，表示大约几百几千的概念。如 two hundred students（两百个学生），hundreds of students（成百上千个学生）。例句中应把hundreds 改为hundred。
17．Their school is twice as larger as our school.
表倍数关系的as---as中间只能用形容词或副词的原级。因此把larger改为large.
18．Today's homework is a five-hundred-words composition.
几个单词由连字符连接而组成的复合形容词中的名词只能用单数，所以把five-hundred-words改为five-hundred-word.
19．Two third of the students in our school are from America.
英语表达中分数的分子用基数词，分母用序数词，分子大于一时分母后要加s，所以就把third 改为thirds.
形容词和副词容易被误用，形容词和副词的比较级和最高级也是应注意的重点。
20．The patient appeared nervously when he talked to the doctor.
appear在此是个系动词，其后应接形容词作表语。所以把nervously改为nervous.
21．The artist worked hardly to finish his drawings on time.
此句需要一个副词来修饰，hardly是副词，但意为“几乎不”，hard 也可以是副词，表努力，因此把 hardly 改为hard.
22．This shirt is more cheaper than that one.
More只构成比较级，而不能修饰比较级。因此把more去掉。
23．He is the most successful of the two businessmen.
两者相比较时，比较级前用定冠词，三者或三者以上才用most，因此把most改为more.
24．He works less harder than he used to.
表不如… 时用less加上形容词和副词的原级，因此把harder改为hard.
25．The book is fairly more interesting than that one.
fairly只能修饰形容词和副词的原级，可以修饰比较级的副词或短语有：
初中英语考试最容易出错的100个考点.docx