牛津实用英语语法:219 条件现在时

　　A 条件现在时由would/should+动词原形构成(用于第一人称)，或由would+动词原形构成(用于其他人称)。

　　肯定式： I would/Id work/I should work

　　you would/youd work等

　　否定式： I would not/wouldnt work或

　　I should not/shouldnt work

　　you would not/wouldnt work等

　　疑问式： would/should I work?

　　would you work?等

　　否定疑问式： should I not/shouldnt I work?

　　would you not/wouldnt you work?等

　　B 这种形式用于：

　　(a)条件句中。

　　(b)would和should的特殊用法中。

　　(c)过去将来时。当主句的主要动词是过去时的时候，从句中就必须用 would/should而不用 will/shall：

　　I hope(that) I will/shall succeed.

　　我希望我会成功。

　　I hoped(that) I would/should succeed.

　　我曾希望我会成功。

　　I know(that) he will be in time.

　　我知道他会赶得上的。

　　I knew(that) he would be in time.

　　我当时知道他会赶得上的。

　　He thinks(that) they will give him a visa.

　　他想他们会给他签证。

　　He thought(that) they would give him a visa.

　　他本想他们会给他签证。

　　I expect(that)the plane will be diverted.

　　我料想飞机会改变航线。

　　I expected(that)the plane would be diverted.

　　我本料想飞机会改变航线。

　　(关于will/shall，would/should在间接引语中的用法，)