4.seldom 一般不用于句末，除非其前带有only，very等修饰。
We go out very seldom. 我们绝少外出。
I play basketball very seldom indeed. 我很少打篮球。
5. always一般不用于句末，偶尔用于句末，此时它不表法“总是”，而表示“永远”。
I’ll love you always. 我将永远爱你。
另外，有时用于句末是因为句子有所省略的缘故。
Generally they walked together on Sunday, but not always.
他们一般在星期日一起散步，但并不总是如此。
句中的but not always=but they didn’t always walk together on Sunday。

三、频度副词位于句首的用法
1. sometimes常可用于句首。
Sometimes she comes late. 有时她来得晚。
Sometimes she didn’t agree with me. 有时她和我意见不一致。
Sometimes we get a lot of rain in August. 有时在8月份雨水很大。
2. often用于句首时，通常表示强调，且其前一般有quite, very修饰。
Very often he comes in late. 他常常迟到。
Quite often the phone rings when I’m in the bath. 电话经常在我洗澡时响。
3.usually有时也用于句首，其前不用修饰语。
Usually I get up early. 我平时起得早。
Sometimes he comes by bus, but usually he comes by taxi.
有时他坐公共汽车来，不过他通常还是打的来。
Usually cooking pots have two small handles but pans have one long handle.
通常地深底煮锅有两只把手而平底锅只有一个长长的把手。
4.always一般不用于句首，除非是用在祈使句中。
Always remember this. 请时刻记住这一点。
Always look in the mirror before starting to drive. 一定要先看看反光镜再开车。
另外，never也可用于祈使句的句首。
Never tell him the news. 千万不要告诉他这消息。
Never ask her about her marriage. 决不要问她结婚的事。
5.在正式文体中，表示否定意义的副词seldom, never可位于句首，但此时其后要用倒装语序。
Seldom has there been such a happy meeting. 过去很少有过这样愉快的会议。
Never did he think the book would be finished so soon. 他可没想到这本书会这么快看完
另外，once a year (每年一次), twice a week (每周两次), three times a day (一天三次), every Saturday afternoon（每星期六下午）等，
这些时间状语也表示频率，它们可以和频度副词用在同一个句子中，表达上没有重复。如：
We usually go to the cinema four times a month. 我们通常一个月看四次电影。

频度副词的用法：
 频度副词是副词的一种,在初中阶段常用的有四个,即always, usually,often,sometimes。它们的用法如下:
一、频度副词在句中的位置。
1.频度副词在句中习惯上位于be动词、助动词之后,行为动词之前。如: 
She is often late for school.她上学经常迟到。
He usually goes to bed at about 12.他通常(午夜)十二点钟睡觉。
When do you usually get up in the morning?早上你通常什么时候起床？
2.sometimes是个特殊的频度副词,既可以放在be动词、助动词之后,行为动词之前,也可以放在句首,还可以放在句尾。如:
I sometimes think that it is a great mistake.我有时想这是一个大错。
Sometimes I help my mother in the house.有时候我帮助妈妈做家务。
3.often可以放在句中,也可放在句尾,习惯上不放在句首。如: 
We have been there quite often.我们经常到那儿去。
She writes to me often. 她经常给我写信。
4.如果有两个助动词，频度副词通常放在第一个助动词后面。如：

We have never been invited to one of their parties. 他们聚会，一次也没邀请过我们。

She must sometimes have wanted to run away. 她有时候一定想到过要逃走。
5.这些频度副词的位置与句中谓语动词有无助动词有关。句中没有助动词时,副词置于动词be之后,其它动词之前。
频度副词位于助动词之前两种情况：
①为了表示强调，频度副词有时也可位于动词be、助动词、情态动词之前，此时助动词等应重读。如：
She always was late. 她老是迟到。
I never can remember. 我永远也记不住。
②在简略答语中，当频度副词与动词be、助动词或情态动词位于句末时，频度副词必须前置。
—“Philip is late again.”
—“Yes, he always is.”
—“菲利普又迟到了。”
—“是的，他总是迟到。”
— “Can you park your car near the shops?”
—“Yes. I usually can.”
— “你可以在商店附近停车吗?”
—“是的，通常可以。”
6.频度副词后的动词可以是动词的任何形式，具体什么形式和频度副词本身没有关系。
如：
I have never been to the moon.
 He sometimes goes to school by bike.
   
二、表示频度方面的区别：
1.always是频度最大的词,意为"总是；永远"。如:
  I shall always remember my first day at school.我将永远记住我上学的第一天。
2.usually意为"通常",即很少例外,频度仅次于always。如:
  What do you usually have for breakfast?你通常早餐吃什么？
3.often意为"经常",在频度上不如usually那么频繁。如:
  Li Ping often does his homework in the afternoon.李平经常在下午做作业。
4.sometimes意为"有时候",频度比often小,表示动作偶尔发生,间断较大。如:
  1.I sometimes go to the library.我有时去图书馆。
  2.Sometimes I read a book in the evening.我有时在晚上看书。

三、频度副词与not连用时,表示部分否定；对频度副词进行提问时,要用how often。如:
1.A great scholar is not always a very wise man.大学者未必一定是极聪明的人。
2.We go to the cinema sometimes.(对划线部分提问)
    How often do you go to the cinema?

考点名称：形容词的比较级，形容词的最高级

• 形容词的比较级：
  当两种物体之间相互比较时，我们要用形容词或副词的比较级；
  当相互比较的物体是三个或三个以上时，我们就要用形容词或副词的最高级。

• 形容词的比较级和最高级的特殊变化规则：
  一、少数单音节词前面加 more-, most- 构成比较级和最高级
  tired ---- more tired , most tired
  fond ----- more fond , most fond
  glad ----- more glad , most glad
  bored ---- more bored , most bored
  pleased---- more pleased , most pleased

  二、不规则变化
  good /well------- better ,best
  bad/badly/ill------ worse , worst
  many/much-------more , most
  little ------ less , least
  far ---- farther, farthes / firther , furthest
  old ---- older , oldest (GA)
      ---- older , oldest / elder , eldest (GB)

  三、下列形容词和副词的比较级和最高级有两种形式
  cruel----- crueler,  cruelest /more cruel , most cruel
  strict---- stricter , strictest /more strict , most strict
  often----- oftener , oftenest / more often , most often
  friendly------ friendlier , friendliest / more friendly , most friendly
  clever----- cleverer, cleverest /  more clever , most clever

  四、下列形容词和副词没有比较级和最高（即表示”最高程度”或”绝对状态”的形容词和副词没有比较级和最高级）
  empty , wrong , perfect , unique , extreme , excellent , favourite (GB)/ favorite (GA) , true , right , correct , extremely ...

• 形容词的比较级和最高级用法：
  形容词比较等级用法：
   1.没有比较对象时，用原级。
   I have a new computer.
   2.两者比较，程度相同。
   A+系动词+as+adj.+as+B.
   Our school is as beautiful as theirs.
   3.两者比较，程度不同。
   A+系动词+not as+adj.+as+B.
   The weather here is not as hot as that in the south.
   4.A比B更…
   The earth is bigger than the moon.
   5.比较级前可以用much,even,still,far,a lot,a little,a bit,any等修饰。
   Your room is much bigger than mine.
   I’m a little shorter than her.
   6.用比较级可以表示最高级含义：
   John is stronger than any other boy in his class.=John is stronger than any of the other boys.
   两者不属于同一范畴，不能用other.
   Chongqing is bigger than any city in Sichuang.
   7.“比较级+and+比较级”   表示“越来越…”
   China is becoming more and more beautiful.
   Days are getting longer and longer.
   8.用the+比较级，the+比较级  表示”越…就越…”.
   The busier he is, the happier he feels.