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，)