A modal auxiliary verb used to refer to a range of possibilities in the future. For example:
If Catherine wanted something, I would give it to her.
I think she would feel left out.
The effect of using would instead of will can be seen when we make the substitution:
If Catherine wants something, I will give it to her.
I think she will feel left out.
The versions using will are more open: the event may or may not happen. The sentences using would seem less open and less likely, although the event is still theoretically possible.
Other uses of would are:
 Habitual actions in the past:
Often she would go to Nairobi or the coast for a break.
 Actions that are regarded as typical:
He would do that, wouldn’t he?
Would is often followed by have, which turns it into a past tense:
I don’t suppose they would have liked it.
In speech this is often shortened to would’ve, which people sometimes confuse with would of:
A number of mourners were quite abusive after the service and if I had not found the funeral so moving I would of asked one or two to step into the vestry.
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