Verified answer

1 If I live to be seventy, I will probably have a lot of grandchildren. (First Conditional, we talk about things which are possible in the future)

2 If I lived to be 170, I would probably have bionic limbs. (it's the Second Conditional, we talk about things in the future that are probably not going to be true)

3 If I go out tonight, I'll come home late. (First Conditional, possibility in the future)

4 If I went out every night, I wouldn't get enough sleep. (Second Conditional)

5 If it was/were sunny at the moment, we would go out. (but it's raining now => Second Conditional)

6 If it had been sunny yesterday, we would have played in the park. (but it was cold and rainy, so we stayed at home - it's the Third Conditional, an unreal past condition)

7 If I forget my mum's next birthday, I won't forget myself. (a possible condition in the future, First Conditional)

8 If I had forgotten my mum's last birthday, she would have felt hurt, I think. (the Third Conditional, an unreal past condition)