英语复习知识点概要more than和necessary
more and more… 越来越……
  Our school is becoming more and more beautiful.我们的校园变得越来越美丽了。
more or less 或多或少；大体上；大约。
①—How far is your family away from here?你家离这里多远？ 
—Ten kilometres ,more or less.大约10公里。
②The work is more or less finished. 这项工作大体上完成了。
no longer 不再。通常置于行为动词之前，动词be之后，偶尔也置于全句的末尾。
①He no longer lives here.他不住这里了。
②Don’t worry about her. After all she is no longer a child .别为她担心。毕竟她不再是个小孩子了。
③I shall wait no longer.我不等了。
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more than
该词组意为“不仅仅是”，“不只是”。
如：Flag is more than a piece of cloth. It stands for a state.
More than 与one 连用，构成词组more than one 后接单数的名词和动词。如：
More than one person is going to lose his job.
must + have + 过去分词
表示推测过去某动作“一定发生了”。如：
—They quarrelled quite often and whenever they quarrelled they threw glasscup at each other.
—They must have broken a lot of glasses.

necessary
  necessary主要用于两种句型：①It’s necessary for sb. to do 
sth.某人有必要做某事②It’s necessary that…有必要……。注意：that从句中谓语用should + 动词原型，should 可省略。另外：不能使用sb. is necessary to do 结构，因为通常是“某事或做某事有必要”，而非人有必要。误：He is necessary to return home this afternoon. 正：It’s necessary for him to return home this afternoon.
[应用]汉译英
①他有必要改进自己的学习方法。
②有必要的话，我们可以多雇几个人收庄稼。
Key:
①It’s necessary for him to improve his method of study:/It’s necessary that the should improve his method of study。
②If necessary,we’ll employ more men for the harvest.
no longer 常可相当于not…any longer. not 用来否定谓语, any longer 置于句末。上面的句子可分别改作:
①He don’t live here any longer.
②Don’t worry about her. After all she isn’t a child any longer.
③I shall not wait any longer.
注意：no more（相当于not…any more）也是“不再”的意思。no longer是把现在的情况和过去对比，时态以现在时为多，有时也用过去时或将来时；no more 指今后如何，通常用将来时态。
①I can no longer stand it.我再也受不了。
②I will go there no more.我再也不到那地方去了。
美国人有时用起来比较随便。
He is no more/no longer ill.他的病好了。
另外：涉及数量或程度时要用no more; 谈到时间表示once but not now（有一度、曾经那样，但现在不了时），要用no longer.
①There is no more bread.没有面包了。
②I no longer support the Conservative Party.我不再支持保守党了。（曾经支持过）
no more than:only仅仅；只有。具有感情色彩，强调“少”。与no less than 相对。
Not more than:less than;at most不到；至多。说明客观事实。与not less than相对。
①He has no more than 20 yuan.他只有20元钱。（强调钱“少”）
He has not more than 20 yuan.他有不到20元钱。（说明客观事实）
②No less than 50 people attended the meeting.参加会议的人不少于50多个。（强调“多”）
Not less than 50 people attended the meeting.参加会议的有50多人。（说明客观事实）
注意：no用于比较级之前总含有感情色彩；not用来否定比较级则只说明客观事实。
①you are no taller than I.你并不比我高。（我们两人都矮）
you are not taller than I.你不如我高。
②This question is no more diffcult than that one.这个问题并水比那个（容易的）问题难。
This question is not more diffcult than that one.这个问题不如那个问题难。

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