用should怎么造句

He should learn to be more polite.

What you should have done is call the police.

Why shouldnt i smoke if i want to?

Please call me should you face any problem.

should 是 v.aux.
(shall 的过去式)

[表示过去将来时; 常用于间接引语]将

[表示语气较强的假设]万一, 竟然

[用于第一人称时表示某种条件下会产生的结果; 用于第二、三人称时表示说话者的意愿]就, 该

[表示可能性、推测、推论]可能, 该

[表示义务、责任]应当, 应该

[表示委婉、谦逊]可, 倒

[用于表示必要、适当、惊奇、遗憾等的从句中]应该; 竟然会

[与why, who, how 等连用, 表示意外、惊异等] 竟会

[用于表示建议、命令、决定等的从句中]应该, 必须

[用于表示目的或由 lest 等引导的从句中]可以, 会; 万一

[用于让步状语从句中]即使

I told you I should be glad to do it. (=I told you, “I shall be glad to do it.”)
我告诉过你, 我是高兴去做的。
If I should fail I would try again.
万一失败, 我还要试一试。
If you [he] had much money, you [he] should buy it.
如果你[他]有许多钱, 你[他]就该把它买下来。
They should have arrived in Beijing by this time.
他们这个时候该到北京了。
You shouldn't be so careles