掌握每一个语法知识，会让你在学习英语的时候更加如鱼得水。下面是小编收集整理的初二英语《定冠词的常见用法》的必备知识点以供大家学习。
定冠词也出现在其他11种情况中，非同时注意不可。
⑴用在单数名词前面，以代表同类的人或物，如：
The ox is a useful animal for farmers.
This type of work is easier for the teacher than for the student.
但当涉及 man 和 woman 这两个名词时，一般上不必用 the ：
Man is mortal.
Woman differs from man in many ways.
⑵用在单数名词前面来表示有关名词的抽象概念，如：
Don&39;t play the fool.
Peter is fond of the bottle.
⑶用在数目字前面，如：
Mr Li is somewhere in the 30s.
She was not yet born in the 50s.
⑷用在测量单位前面，以表示“每”(each/per)，如：
Some factory workers are paid by the hour.
This car usually does 15 kilometres to the litre.
⑸用在比较级形容词或副词之前，以加强其意义，如：
The teacher explained the idea again, but his students were none the wiser.
Your mind will function all the better if you have some time away from your work.
⑹用在“the more/better……the more/better……”结构里，如：
The more we practise, the more we improve.
The better the staff, the better the performance.
⑺用在乐器名称之前，如：
The piano sounds better than the organ.
⑻用在剧院、电影院之前，如：
Do you often go to the cinema?
Tom went to the Lido last week.
⑼用在四个方向之前，如：
The sun rises in the east and sets in the west.
⑽用在复数姓氏之前，以表示有关家人，如：
The Browns will visit us tonight.
⑾用在某些惯用语之前，如：
We know the ins and outs of the matter.
Compare the pros and cons before you make your decision.
"John is smart, isn&39;t it?"
这个疑问句里的附加语(question tag)对吗?如果是不对的话，错在哪里?
在公共场所或办公室里，只要稍为留心，不难听到“ isn&39;t it ? ”这个附加语。这种疑问句是英文几种疑问句中的一种，主要的用途在强制答话人提供问话人心目中的答案。
这个疑问句有一定的格式，即：
·肯定叙述句(affirmative statement)+否定附加语(见例 ①及②)
·否定叙述句(negative statement)+肯定附加语(见例③及 ④)
①Mary is happy, isn&39;t she?
②They will come, won&39;t they?
③Mary isn&39;t sad, is she?
④They won&39;t come, will they?
此外，附加语中的代名词(pronoun)和助动词(auxiliary verb)必须和叙述句中的相符。
这类疑问句看似简单，其实容易出差错。其中一个错误便是附加语的时态(tense)不对，如：
⑤You could hardly expect him to help you, can you?
⑥The minister will talk about regional cooperation, wouldn&39;t he ?
另外一种错误是助动词的错用，如：
⑦The clerks are working hard, don&39;t they?
⑧Betty won&39;t be a sportswoman, can she?
“isn&39;t it”的滥用
最常见的错误来自“isn&39;t it”的滥用，如：
⑨Jason likes this book very much , isn&39;t it?
⑩She can sing well, isn&39;t it?
11.Our team won, isn&39;t it?
12.Young Singaporeans have become achievement - oriented , isn&39;t it?
13.All our teachers are dedicated, isn&39;t it?
14.They will go shopping on Sunday, isn&39;t it?
这6个错误的附加语改正如下：
⑨Jason likes this book very much, doesn&39;t he?
⑩She can sing well, can&39;t she?
11.Our team won, didn&39;t it?
12.Young Singaporeans have become achievement - oriented, haven&39;t they?
13.All our teachers are dedicated, aren&39;t they?
14.They will go shopping on Sunday, won&39;t they?
"lsn&39;t it ? "在下列3个句子中才是正确的用法：
15.It is fine today, isn&39;t it?
16.That story book is interesting, isn&39;t it?
17.It is worthwhile learning a second language well, isn&39;t it?
现在再看看“John is smart , isn&39;t it ?”错在哪里。很明显的，错在附加语里的代名词：应该是“he ”，不是“it”，全句如下：John is smart, isn&39;t he?