Would means something is being done or has the possibility or intention to be done. Depending on the context it can me something like could, will, do/does. She wouldn't leave = She refused to (intended not to) leave. The windows would not close = The windows could not close= The windows were not able (possible) to be closed. Who would live here= Who could live here= Who might live here= Who possibly lives here. Would you pour= Will you pour = Could you pour (but could just asks if the person has the ability to pour. Would asks if the have the ability and intention to pour.) I would have to agree= I will have to agree.

For general questions like this, you can simply use a dictionary. The Free Dictionary gives example sentences as well as definitions. Have a look: http://www.thefreedictionary.com/would