$1$. If i were rich, i would live in a big house

        Unless i were rich, i wouldn't live in a big house

$2$. If sandra got her camera, she could take a photo

        Unless sandra got her camera, she couldn't take a photo

$3$. If she didn't bought a lot of clothes, she would have money

        Unless she didn't bought a lot of clothes, she wouldn't have money

$4$. If we got calculator, we could work this out quicker

        Unless we got calculator, we couldn't work this out quicker

1. If I were rich, I would live in a big house

Unless I am rich, I won't live in a big house

2. If Sandra had got her camera, she could take a photo

Unless Sandra has got her camera, she can't take a photo

3. If he had some money, she would buy a lot of clothes

Unless he has some money, she won't buy a lot of clothes

4. If we had got caculator, we could work this out quicker

Unless we have got calculator, we can't work this out quicker