'Should' is the past tense of the word 'shall.' When using the words 'should have' you are talking about something in the past that you 'ought to' or 'might have' done.

'Should'是'shall'的过去时态，当用'should have'这个词的时候你是在讨论过去你'ought to'或者'might have'做的某事。

Here are some examples: 这里有一些例子： 

"I should have gone with you."

 我本应该和你一起去的。

"I should have studied more for my test."

 我本应该为考试多加学习的。

"I should have read the directions before starting."

 我本应该在开始之前阅读说明书的。

"I should have eaten breakfast this morning."

 我本应该今天早上吃早饭的。

"I should have listened to your advice."

 我本应该听你的意见的。

"I should have married her when I had the chance." 

当有机会的时候，我应该早点娶她。

'Shall' is something that will take place or exist in the future.

'Shall'是将要发生或者存在于未来的某事。

Here are some examples: 这里有一些例子： 

"I shall leave tomorrow."

 我明天会离开。

"I shall finish the job next week."

 我下周将完成这项工作。

"I shall see it tomorrow." 

我明天就去看。

"I shall go outside if it's nice out."

 如果天气好的话我就到外面去。

"I shall pay for this later."

 我等一下会付的。