Because the weather was very cold yesterday, we didn’t go swimming.
-> If the weather hadn't been cold yesterday, we would have gone swimming.
Giải thích:Áp dụng câu điều kiện loại 3,ta có công thức:IF +S +HAD +$V_{3/ed}$ , S + WOULD ( COULD, MIGHT ) HAVE + $V_{3/ed}$