Here are the examples:
- The car won't start.
- The car wouldn't start
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"The car won't start" - generally a statement of fact (either about the future or, often, effectively about the present).
"The car wouldn't start" - either a conditional statement (which may express contingency or tentativeness) or a statement about the past. Some of its uses are more or less interchangeable with "won't start" but express greater tentativeness:
The past use of "wouldn't" can also effectively be almost equivalent to "won't", if the context makes clear that the issue is believed to be ongoing:
However, in other cases it refers to a past situation that no longer obtains or which might no longer obtain, and so it is clearly distinct from "won't":
Basically both of them mean the same and I say it again Basically.
However when you use won't or will, your trying to imply that the level of certainty is higher and you're quit sure about it. Example:
I will drive to work
basically means that your are certain. On the other hand would is a type of "being not sure". It is like you don't know if it's going to work for you or in your example if it is going to start eventually. Example:
I would drive to work
There are other uses of these words One of which is "Desire" for will and "Willingness" for would, So this is the reason I said they are basically the same because when you would to do something..., it means that you are not certain. However when you will do something..., means that you are sure about it.