在什么情况下形容词的最高级不用加定冠词the?

在什么情况下形容词的最高级不用加定冠词the?
比较级怎么用?

形容词最高级的用法:
形容词最高级用于两个以上的人和物进行比较, 其结构形式为:
主语+谓语(系动词)+the+形容词最高级+名词+表示范围的短语或从句.
She is the best student in her class.
她是班上最好的学生.
Shanghai is one of the biggest cities in China.
上海是中国最大城市之一.
This is the biggest apple I have ever met.
这是我见到的最大的苹果.
Tom is the tallest boy in his basketball team.
汤姆是他们篮球队中个子最高的孩子.
[编辑本段]几个特殊用法:
most 同形容词连用而不用 the,表示 "极,很,非常, 十分".
It's most dangerous to be here.
在这儿太危险.
I cannot do it, it's most difficult.
我干不了这件事,太难了.
"The+形容词比较级..., the+形容词比较级..."表示 " 越... 就越...".
The more you study, the more you know.
你学的越多, 就知道的越多.
The more I have, the more I want.
我越有就越想要有.
The more, the better.
越多越好.
" 形容词比较级 + and + 形容词比较级 ", 表示 " 越来越... ".
It's getting hotter and hotter.
天气越来越热了.
It's pity he is getting poorer and poorer.
真可怜他越来越穷了.
The computer is cheaper and cheaper.
计算机越来越便宜.
The more and more people focus on the meeting next year.
越来越多的人关注明年的会议.
主语+谓语(系动词)+as+形容词原形+as+从句.表示两者对比相同.
This box is as big as mine.
这个盒子和我的一样大.
This coat is as cheap as that one.
这件衣服同那件衣服一样便宜.
I study English as hard as my brother.
我同我兄弟一样学习努力.
用形容词表示类别和整体
the + 形容词 表示某种人.
He always helps the poor.
他经常帮助穷人.
I like to have a talk with the young.
我喜欢同年轻人谈话.
The rich sometimes complain their empty life.
富人有时抱怨他们空虚的生活.
The police led the old man across the street.
警察领老人横过马路.
以-ly结尾的形容词
1） 大部分形容词加-ly可构成副词.但 friendly,deadly,lovely,lonely,likely,lively, ugly,brotherly,仍为形容词.
改错：(错） She sang lovely.
（错） He spoke to me very friendly.
（对） Her singing was lovely.
（对） He spoke to me in a very friendly way.
2）有些以-ly 结尾的词既为形容词,也为副词.
daily,weekly,monthly,yearly,early
The Times is a daily paper.
The Times is published daily.
多个形容词修饰名词的顺序
多个形容词修饰名词时,其顺序为：
限定词--数词--描绘词--(大小,长短,形状,新旧,颜色) --出处--材料性质,类别--名词
a small round table
a tall gray building
a dirty old brown shirt
a famous German medical school
an expensive Japanese sports car
一般与被修饰名词关系密切的形容词靠近名词；如果几个形容词的重要性差不多,音节少的形容词在前,音节多的方在后,在不能确定时,可参照下表：
限定词+数量词（序数词在前,基数词在后）+性状形容词+大小、长短、高低等形体+
those + three + beautiful + large + square
新旧+颜色+国籍+材料+名词
old + brown + wood + table