Ex 1:

$\text{1.}$ If it hadn't rained, we could have gone camping.

$\text{→}$ Câu đk loại 3 trái với QK: If + QKHT, S + would/ could/ might + have + Ved/ P2

$\text{2.}$ If I hadn't missed the bus, I wouldn't have been late for work this morning.

$\text{→}$ Câu đk loại 3

$\text{3.}$ If Tom hadn't been busy, he could have accepted your invitation.

$\text{→}$ Câu đk loại 3

$\text{4.}$ If my sister hadn't had a cold, she wouldn't have gone to a doctor.

$\text{→}$ Câu đk loại 3

$\text{5.}$ If you asked me, I would lend you my car.

$\text{→}$ Câu đk loại 2 trái với HT: If + S + Ved/ P1/ were, S + would/ could/ might + V.

$\text{6.}$ If we had a bicycle, we could go for a picnic.

$\text{→}$ Câu đk loại 2

$\text{7.}$ If she weren't tired, she could eat.

$\text{→}$ Câu đk loại 2