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The affirmative form is formed with subject, had and the past participle of the verb, the same thing is true for the negative form only that instead of had we put not.
The interrogative form is formed by had, the subject and then the past participle, the short answers are very simple: yes / no, subject and had.
Examples:
-I had worked at home./I had eaten fish.
-We hadn’t studied for English test./you hadn’t paid the bag.
-Had they done their homework? Yes, they had/had not.

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To understand when the past perfect and the past simple are used, we can draw a timeline and identify the past simple as the past action closest to the present while the past perfect can be identified as an older action than the past perfect.
Examples:
-Past simple: I went to the cinema yesterday.

-Past perfect: I had gone to the cinema five days ago.
-Past simple VS past perfect: yesterday I didn’t eat because the day before yesterday I had eaten so much.

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The third conditional is formed with the form would have/ would have not+past participle of verbs in the main sentences and in the sentences subordinate to the main ones, the conjunction, usually if, and the past perfect are used.
Examples:
-if I had worked harder I would have passed the exam.
-if I had known you were coming I would have baked a cake.
-I would have been happy if you had called me on my birthday.

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EXPRESSING DISAPPROVAL AND REGRET IN THE PAST

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EXPRESSING DISAPPROVAL AND REGRET IN THE PAST

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As we can read from the image, there are expressions to regret or disapprove of something.
Should have + past participle is used for some regret, something we would have liked to do or say;  while should not have + past participle is usually used for a disapproval in the past.
Examples:
-he should have sent everybody a reminder by email.
-they should have remembered that their guests don’t eat meat.
-I shouldn’t have left the office so late.
-they shouldn’t have sacked him.