3rd and and mixed (3/2) conditionals
(REDO) Beth didn't study. She didn't pass the exam. (could)
If Beth had studied, she could have passed the exam.
(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
(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 ...