[限定词和代词]much和many的比较级:There are more rooms upstairs. Can I have two more?
[副词]和形容词、副词连用构成比较级:The fish here is more expensive. You should practise more often.

注意:单音节形容词或以-y结尾的双音节形容词一般用后缀-er而不用more构成比较级：cleaner,happier.其他的双音节形容词
用-er或more都可以: more simple或simpler;more clever或cleverer等等.单音节副词也用-er构成比较级:faster,harder.不规则
的比较级形式有better,worse和father或further.

语法结构
1 more | + 复数名词或不可数名词
  Can you make me some more copies?
  They are predicting more rain.
  表示一个更多的或额外的数量
 
2  more | ( + of + 名词短语)                          
  This is delicious. ~Would you like some more?
  Do you have any more of these plastic folders?
  表示一个更多的或额外的数量
 
3 more | + than | + 数字/数量
  There were more than a million people at the march.
  The tank is more than half full.
  表示真实的数字或数量更大
 
4 more | (+ and more) | + 形容词 | ( + than...)   
  形容词 + -er |( + and 形容词 + -er) | (+ than ...)
  Cities have become more crowded.
  I was growing more and more impatient.
  The days are getting longer.
  Asthma is more common than it used to be.
  描述变化的过程
  This flat is nice but the other one was incer.
  Laptop computers are still more expensive than desktops.
  作比较
 
5  动词 | + more | ( + and more) | + 副词 | (+ than) 
   动词 | + 副词 + -er|(+ than)
   Since the accident,he drives more carefully.
   She ran faster and faster.
   Fred danced better than he sang.
   表示做事方式的改变，比较做事的方式
  
6  动词 | + more
   The front row seats are the best but they cost more.
   You need to watch TV less and read more.
   表示某种状态或活动的增长

7  the more | + 形容词/副词/名词短语 | + the more | + 形容词/副词
   The more often you practise,the more confident you will get.
   The more students,the better.
   When do you want these copies done? ~The sooner,the better.
   表示某一事物是如何因为另一事物的变化而产生变化的

搭配
   more(用作限定词和代词)前面经常有表示数量的词,如:some,any,no;many,much,a few,several; a bit,
   a lot ,lots和数字:one,two等等.
  
      I'd like a few more of these please.
      Do you have any more wrapping paper?
      There are lots more chairs in the other room.
     
   more用作副词,前面经常有much,a bit,a lot:
      This restaurant is much more expensive than it used to be.
      Jenny is a lot more friendly these days.
     
固定短语
   more and more... = increasing numbers or an increasing amount of
   越来越多的数字或数量
   There were more and more people arriving all the time.
  
   more or less...=almost几乎
   Are you ready to go?~More or less.
   The painting is more or less finished.
  
   more than likely = very likely 非常可能,极有可能
   Do you think it will rain?~More than likely.
  
   (and )what's more... = moreover而且
   The 'Handy' is inexpensive and ,what's more,it's economical on fuel.