Unless he does morning exercise. He wont help good helth

Bt1) Rewrite
1) Unless he does morning exercise. He wont help good helth
-> If
2) He cant come because she is seriously ill
-> Unless
3) He couldnt come because they were busy
-> If
4) The couldnt go fast because of the fog
-> If it
5) The storm prevented us from driving fast
-> we would have