Verified answer

Règle :

SUBORDONNEE                                PRINCIPALE

Potentiel du présent

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IF + Présent                                        Futur
If you invite me to the cinema,              I will be very happy.
Si tu m'invites au cinéma,                    je serai très heureuse.

Irréel du présent

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IF + Prétérit                                        Conditionnel présent
If you invited me to the cinema,            I would be very happy.
Si tu m'invitais au cinéma,                    je serais très heureuse.

Irréel du passé

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IF + Pluperfect                                   Conditionnel passé
If you had invited me to the cinema,     I would have been very happy.
Si tu m'avais invitée au cinéma,           j'aurais été très heureuse.

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Aussi, je mettrais :

I had known — I would have gone
he had missed — he would have missed
I would have forgotted — you had not reminded
I have had — I would have sent
we would have enjoyed — the weather has been

If I had been hungry, I would have eaten something
If you hadn't lived so far away, we would have seen you very often.
If the road hadn't been icy, the accident would not have happened.
If Karen hadn't been wearing a seat belt, she would have been injured in the crash.
If this book hadn't been not so expensive, I would have gone to buy it.
If it hadn't been raining, we would have lunched outside.

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Voilà.