a simple past tense and past participle of will1.
(used to express the future in past sentences): He said he would go tomorrow.
(used in place of will, to make a statement or form a question less direct or blunt): That would scarcely be fair. Would you be so kind?
(used to express repeated or habitual action in the past): We would visit Grandma every morning up at the farm.
(used to express an intention or inclination): Nutritionists would have us all eat whole grains.
(used to express an uncertainty): It would appear that he is guilty.
(used in conditional sentences to express choice or possibility): They would come if they had the fare. If the temperature were higher, the water would evaporate.
would have, (used with a past participle to express unfulfilled intention or preference): I would have saved you some but Jimmy took it all.SEE MORESEE LESS