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英语中than可用于连词和介词，详细用法如下：
1，than用作连词的意思是“比”,可指两个不同的人或物在同一方面进行比较,也可指同一个人或物在两个不同方面进行比较。
2，than用作连词时接名词或代词的主格形式是较正式的用法,若人称代词之后跟有动词, than后的人称代词只能用主格。
3，若than所连接的两个待比较的句子有相同成分,后者通常省略,若所连接的两个待比较的没有相同成分则不能省略。
4，than若是连接两个非谓语动词,通常应保持一样的形式,若不是连接两个非谓语动词则其后通常用动名词。
5，than也可以用于两项事物比较时,引导的是被摒弃的那一项。
1，than用作介词时意思为“与…相比”,用于名词或代词前表示比较关系,也可用于在度量衡方面的比较。
2，than用作介词时其后接名词或代词的宾格形式是非正式用法,若人称代词之后有all, both则通常用宾格。
用作连词 (conj.)
She was older than I was.
她年纪比我大。
I was inspired to work harder than ever before.
我受激励比以往任何时候都更加努力地工作。
用作介词 (prep.)
This street is four times shorter than that one.
这条街道比那条短四倍。
John is more diligent than anyone else in his class.
约翰比班上其他的同学用功。
有多久没见你
下面的文字摘自“英语语法网”，可供你参考：……有时可引导一个从句并在从句中充当句子成分(主语、宾语、表语)，为便于理解，有时可视为than后省略了what：We don’t want to do more than is necessary. 我们不想做不必要的事情。The pain was almost more than he could bear. 这样的痛苦几乎使他受不了。She’s not a very good manager she always spends more money than she earns. 她不大会理财——总是入不敷出。 Life here is much easier than it used to be. 如今在此地生活比起从前可舒服多了。比较下面一句，than后的expected为省略结构：He returned three days earlier than (he was) expected. 他回来得比预料的要早三天。
孑子孓COMIC
than [ðæn; 弱ðən; ðn] conj.连词1.[用于形容词、副词的比较级之后]比；与…比较：例句:She is taller than me.她比我高.Thomas arrived earlier than the others.托马斯比其他人早到.2.[用于 anywhere,different,else,other,otherwise 等之后]除…(外)：例句:She has no other friend than Jane.除简外她没有朋友.It was none other than the professor.不是别人,正是教授本人.3.[用于 barely,hardly,scarcely之后,表示时间]一…就…：例句:Scarcely had I seen him than he spoke to me.我刚看见他,他就跟我说起话来.They barely arrived than it was time to leave.他们刚到就该离开了.4.[用于 rather,sooner等之后]与其…(毋宁、宁愿或不如…)：例句:I prefer to work rather than go to holiday to the seaside.我宁愿工作也不愿去海滨度假.prep.介词1.[书面语][用于 than whom,than which 两个词组]比;与…比较：例句:a writer than whom there is none finer最佳作家He is a teacher than whom a better dose not exist.哪个教师也比不上他.2.[用于计量数目之前]超过：例句:This car goes faster than 120 miles per hour.这辆汽车的时速超过120英里.短语1.no more than仅仅,只是2.none other than正是,不是别的3.no other than
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than的用法：
1、用于形容词、副词的比较级之后，比；与…比较：
She is taller than me.
她比我高。
Thomas arrived earlier than the others.
托马斯比其他人早到。
She speaks more English than she did last term.
她讲英语比上学期要多。
It's colder in Beijing than in London in winter.
在冬天，北京要比伦敦冷。
The students in Class 2 are more active than those in Class 1.
二班的学生要比一班活跃。
2、用于 anywhere,different,else,other,otherwise 等之后，除…(外)：
She has no other friend than Jane.
除简外她没有朋友。
It was none other than the professor.
不是别人，正是教授本人。
The student is otherwise than his teacher thought.
那个学生并不是老师想像的那种人。
You won't find such freedom anywhere than in our country.
这种自由除我们国家以外其他地方找不到。
3、用于 barely,hardly,scarcely之后,表示时间]一…就…：
Scarcely had I seen him than he spoke to me.
我刚看见他，他就跟我说起话来。
They barely arrived than it was time to leave.
他们刚到就该离开了。
4、用于 rather，sooner等之后，与其…(毋宁、宁愿或不如…)：
I prefer to work rather than go to holiday to the seaside.
我宁愿工作也不愿去海滨度假。
5、书面语，用于 than whom,than which 两个词组，比;与…比较：
a writer than whom there is none finer
最佳作家
He is a teacher than whom a better dose not exist.
哪个教师也比不上他。
6、用于计量数目之前，超过：
This car goes faster than 120 miles per hour.
这辆汽车的时速超过120英里。
7、用作连词的意思是“比”,可指两个不同的人或物在同一方面进行比较,也可指同一个人或物在两个不同方面进行比较。
He's more fat than (he's) short.与其说他矮不如说他胖。
They are more brave than wise.他们有勇无谋。
8、用作连词时接名词或代词的主格形式是较正式的用法,若人称代词之后跟有动词, than后的人称代词只能用主格。
He is taller than l am.他比我高。
He swims faster than she does.他比她游泳游得快。
10、带有never(a)的比较级结构后连用了than时，是一种强调说法，通常表示最高级的含义。如：
I've never had a worse morning than today.我哪一天早上也不像今天早上这样倒霉。
若意思明确，有时可省略than结构。如：
He is fine,never better.他很好，比以往任何时候都好。
11、若语义需要，有时可接when，if等引导的从句。如：
You are a little father than when I saw you last .你比我上次见你时胖点了。
有时还可以接没有任何引导词的句子。如：
The game was closer than the score suggests.实际的比赛比所得的分数相比更难分高下。
短语:
