Ответ:
If he had remembered earlier, he would have sent her a birthday card.
If you hadn’t been ill, you would have gone to the party.
Jason would not have broken his arm if he had been more careful.
Helen would have got wet if she had not taken her umbrella.
If I had done my homework, my teacher would not have shouted at me.
You would have passed the test if you had studied more.
If she had closed the gate, the rabbit would not have run away.
She would have lost her keys if I had not picked them up.
If he had saved some money, he would have been able to go on holiday.
If you had not been in a hurry, you would not have forgotten your keys.