1. Often used in auxiliary functions with rather to express preference:
ex: I would rather go shopping today.
2. Used to express a wish or desire:
ex: I would like to have one more pencil.
3. Used to express contingency or possibility:
ex: If I were you, I would be so happy.
4. Used to express routine or habitual things:
ex: Normally, we would work until 6 p.m.