If he (practice) every day, he (become) a champion.

I (visit) Sarah yesterday if I (know) that she was ill.

If I (be) you, I (speak) to her

If he (be) a millionaire, he (be) happy

If he practices every day, he will become a champion.  

I would have visited Sarah yesterday if I had known that she was ill.

If I were you, I wouldn't speak to her.

If he were a millionaire, he would be happy.