They should have done more research.

I ought to have left here by 3.30.

Surely they should have got home by midnight.

请问这三句中should / ought to have done表达的语法意义是一样的吗？

【1】主语+should have done sth 表示主观上应该做某事却没有做

They should have done more research.（表示主观）

（表示主观，含有责备或不满）

【2】主语+ought to have done sth 表示客观上本应该做某事却没有做

I ought to have left here by 3.30.（表示客观）

（表示客观，含有责备和遗憾且语气更强）