(MISTAKE) If they hadn’t been found by the helicopter, they could died in the mountains.
... could have died ...
(MISTAKE) They mightn’t have bought tickets if they’d known the play was so dreadful.
correct
(PUT) If I hadn't fought for our relationship, we ____ (be) together now.
wouldn't be
(PUT) If you ____ (accept) that job, you would be miserable now.
had accepted
(REDO) Miranda lost all her money on the stock market. That's why she's not rich now. (would)
If she hadn't lost ... , she would be rich ...
(MISTAKE) If we’d know about the party, we might’ve gone.
... known ...
(REDO) Beth didn't study. She didn't pass the exam. (could)
If Beth had studied, she could have passed the exam.
(PUT) I feel fine because I took the medicine. If I _____ the medicine, I would still be in pain.
hadn't taken
(REDO) The plant died because you didn't water it (would not)
If you had watered it, it would not have died
(REDO) You didn't invite me to the party. That's why I didn't come. (would)
If you had invited ..., I would have come
(PUT) I am where I am today because you helped me. I _____(be) where I am today if you hadn't helped me.
wouldn't be
(MISTAKE) If he would’ve been born in the nineteenth century, he wouldn’t have inherited his father’s money.
... had been born ...
(REDO) They stopped the fire. That's probably why it didn't destroy most of the building (could)
If they hadn't stopped the fire, it could have destroyed ...
(PUT) If you ______ (take) dad's car without permission last night, you might be in trouble.
had taken