例句：I want to eat apple.
应改成：I want to eat an apple.
例句：I was born in the Shanghai.
应改成：I was born in Shanghai.
例句：Play the football
类似情形有：Have lunch, Go home, By car等都不使用冠词。
a.有一些词或者短语后面一般要加可数名词的复数，如“a few, few, a variety of, various, other, numerous等。
例句：Smoking cessation is one of the likely factor that contribute to the development of obesity.
应改成：Smoking cessation is one of the likely factors that contribute to the development of obesity.
b.有一些词后面一般要加可数名词的单数，如“any other, another, each, neither, either”。
例句：Many teenagers begin smoking habits due to peer pressure but not for any other reasons.
应改成：Many teenagers begin smoking habits due to peer pressure but not for any other reason.
c.有一些词或者短语后面一般要加不可数名词，如“a little, little, less, much, enormous, a large amount of ”。
例句：Little progresses have been made towards tackling poverty.
应改成：Little progress has been made towards tackling poverty.
例句：I will discuss in some detail.
应改成：I will discuss this topic in detail.
例句：Education can let young people to find jobs easily after they finish their education.
应改成：Education can let young people find jobs easily after they finish their education.
a.介词不是连词，一般后面只接名词或者具备名词性质的短语或者带连词的宾语从句。比较容易被当做连词的介词有“despite,in spite of,during,because of,due to”，也不能加动词。
例句：Many children depend on their parents give support.
应改成：Many children depend on their parents’ support.
b.“to”在某些情况下(如词组“give rise to, contribute to, pay attention to, conform to, lead to”)作介词，需要加名词或者具备名词性质的东西充当宾语，而不是加动词原形充当不定式。
例句：There are many solutions to deal with the problem.
应改成：There are many solutions to the problem.
例句：Although the crime rate is falling in many parts of the world, but violent crimes are constantly rampant.
应改成：Although the crime rate is falling in many parts of the world, violent crimes are constantly rampant.
例句：Smoking, drinking are banned in many places of work.
应改成：Smoking and drinking are banned in many places of work.
例句：I thought the reason why I chose to study that subject was I could got a betterjob after learning that
应改成：I thought the reason why I chose to study that subjectwas I could get a better job after learning that.
例句：Some parents do not obey traffic rules himself.
应改成：Some parents do not obey traffic rules themselves.
例句：Intelligent students should not be treated different by their teachers.
应改成：Intelligent students should not be treated differently by their teachers.