Modals

Perfect Modals
are used to talk about the past and what was advisable in the past.
Modal + have + past participle

I should have cooked more burgers.  Now we don’t have enough.

Sam must have gone to the beach yesterday.  He has a sunburn today.

She might have left her keys on the table, but she’s not sure.

They could have driven their car, but they decided to walk instead.

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She might have come to the house.

    You should have stayed in bed.
   
      You were supposed to be here at 9:00.

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There are belief modals that express degrees of certainty
She must have gone to the party.

There are social modals that express suggestions, expectations, obligations, and so on.
You should have called your wife

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There are belief modals that express degrees of certainty
She must have gone to the party.

There are social modals that express suggestions, expectations, obligations, and so on.
You should have called your wife
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Should have +  past participle

When the action did not happen and someone is sorry 

(regrets) that the action did not happen.

I failed the test.  I should have studied last night.

My stomach hurts! I shouldn’t have eaten those four doughnuts.

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