We use 'should have' or ‘should not have’ with ‘past participle’ to talk about past regrets or past event that did not happen.
Examples:
• You got very less marks in exams. You should have studied hard.
• He should not have argued with his mother.
• You should have remembered that my mother doesn’t like fish curry.
We can also use 'should have' with past participle to speculate about events that may or may not have happened.
Examples:
• She should have explained him everything. Let’s work on our next plan.
• He should have reached home by this time. Let me call him. We use should + 1st verb to give suggestions.
Examples:
• You should not give him pocket money as he doesn’t use it at right place.
• He should come on time.

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