Without air,we should be forced to seek shelter from the sun...Without air,we should be forced to seek shelter from the sun,as there would be no atmosphere to protect us from the sun's deadly rays.为什么用should be forced而不用would be forced,

Without air,we should be forced to seek shelter from the sun...Without air,we should be forced to seek shelter from the sun,as there would be no atmosphere to protect us from the sun's deadly rays.为什么用should be forced而不用would be forced,
Without air,we should be forced to seek shelter from the sun...
Without air,we should be forced to seek shelter from the sun,as there would be no atmosphere to protect us from the sun's deadly rays.
为什么用should be forced而不用would be forced,虚拟语气不是用would do形式吗

Without air,we should be forced to seek shelter from the sun...Without air,we should be forced to seek shelter from the sun,as there would be no atmosphere to protect us from the sun's deadly rays.为什么用should be forced而不用would be forced,
would 为主观能动的,而should是逻辑推理性的

should也是虚拟语气常用的词。

5特殊的虚拟语气词：should
1） It is demanded / necessary / a pity + that…结构中的主语从句的谓语动词要用should 加动词原形， should 可省略。
句型：
(1)suggested
It is (2)important that…+ (should) do
(3) a pity<...

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5特殊的虚拟语气词：should
1） It is demanded / necessary / a pity + that…结构中的主语从句的谓语动词要用should 加动词原形， should 可省略。
句型：
(1)suggested
It is (2)important that…+ (should) do
(3) a pity
(1)suggested, ordered, proposed, required, demanded, requested, insisted； + (should) do
(2)important, necessary, natural, strange
a pity, a shame, no wonder
(3)It is suggested that we (should) hold a meeting next week.
It is necessary that he (should) come to our meeting tomorrow.
a. 同现在事实相反的假设。
句型 ： 条件从句 主句
一般过去时 should( would) +动词原形
If they were here, they would help you.
b. 表示于过去事实相反的假设。
句型： 条件从句 主句
过去完成时 should(would) have+ 过去分词
If she had worked harder, she would have succeeded.
The rice would not have been burnt if you had been more careful.
If my lawyer had been here last Saturday, he would have prevented me from going.
If he had come yesterday, I should / would have told him about it.
含义：He did not come yesterday, so I did not tell him about it.
If he had not been ill and missed many classes, he would have made greater progress.
含义： He was ill and missed many lessons, so he did not make greater progress.
c. 表示对将来的假想
句型： 条件从句 主句
一般过去时 should+ 动词原形
were+ 不定式 would + 动词原形
should+ 动词原形
If you succeeded, everything would be all right.
If you should succeed, everything would be all right.
If you were to succeed, everything would be all right.

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