I would sleep, if I could 
I will sleep, If I can 
No se

If I have money ,I will buy it 
If I had money, I would buy it 
No se

I will read it ,if you have it 
I would read it, if I had it 
No se

You must drink water 
You ought to drink water 
No se

You ought not to sleep now 
You mustn't sleep now 
No se