Conditional
The conditional is formed using the modal 'would' in front of an infinitive (dropping the word 'to'). The conditional is used especially in three contexts:
1) Politeness
I would like the menu, please.
Would you have a couple of minutes for me?
2) To indicate the 'future within the past':
She said she would come to the party.
I thought he would arrive before me.
3) In hypothetical constructions with 'if.' When 'if' is followed by the preterit or the subjunctive, the conditional is expected in the second clause:
If I had the time, I would do my homework.
If you told me the truth, I would believe you.
The 'if' of hypothetical expressions can be implicit:
In your position (= if I were you), I wouldn't stay here!