主语从句：It is（was） + 形容词+ that …should + 动词原形
It is necessary that the meeting should be held tonight.
important， essential， imperative， suggested …
宾语从句：及物动词 + that …should + 动词原形
I suggest that the meeting should be held tonight.
Require， request， demand， propose， insist …
表语从句： 名词 + 系动词 + that …should + 动词原形
My suggestion is that the meeting should be held tonight.
decision， proposal， advice， order …
同位语从句：抽象名词 + that …should + 动词原形
He gave the proposal that we should hold the meeting tonight.
2.would rather /would sooner
We would rather talk about the football or weather or what we had for lunch.
3.it's （high） time that 一般使用过去时动词。
4.lest， for fear that， in case 后面的句子中要用“should+动词原形”
1.classify 2.approximate 3.proportion 4.appreciation 5.acknowledge 6.alter 7.lengthen 8.wealthy 9.neglect 10.expectation
1.to approximate to 2.resistance to 3.to cope with 4.attribute … to
1.Nations are classified as “aged” when they have 7percent of more of their people aged 65 or above.
2.The nearer a society approximates to zero population growth， the older its population is likely to be - at least ， for any future that concerns us now.
3.The older you are now， of course， the greater this proportion will be， and greater still if you are a woman .
4.If you are now in your thirties， you ought to be aware that you can expect to live nearly one third of the rest of your life after the age of 60.
5.If， however， children grow up without love and without feelings of self-worth， they feel unlovable and worthless and expect to be cheated， taken advantage of， and looked down upon by others.
look down upon ： 看不起…； 轻视… ；
6.without a healthy self-esteem they may cope by acting out problems rather than talking them out or by withdrawing and remaining indifferent toward themselves and others.
7.It is not until energies are back to normal that the real problem is recognized.
8.it is not until about the time the child enters school that outside forces contribute to feelings about the self.
Aging has become a social problem.
The resistance to the idea is caused by the falling of birthrates.
The fall of birthrate resulted in people's objection to the idea.