A website explaining "would" categorizes the usage of "would" into many ways. The most confusing one is "presumption" and "conditional".
- You'd never know it. (for example: If you met him you would never know that he was rich.)
- Why don't you invite Mary? I'm sure she'd come.
2. Presumption or expectation
- That would be Jo calling. I'll answer it.
- We saw a police helicopter overhead yesterday morning. | Really? They would have been looking for those bank robbers.
What is the criteria to distinguish presumtion and conditional? Espeically in conditional-clause-implied sentences like "I'm sure she would come", it seems either conditional or presumtion or the gray area between the two.
What if you just say "I think Jane would come to the party" while talking about the people who can come to the party with your friend? There is no conditional clause in advance or no if clause is implied here. You just guess she might come to the party
I think the difference could be that for "presumption", it could be either real or unreal as in the case "That would be Jo calling". The caller could be Jo, so it can real, but for conditional clauses, only when the conditional clause is met, the main clause can be real or unreal. But as the conditional clause is basically hypothetical and not true, so basically the main clause is no true. Am I right?
This is really bothering me as Korean doesn't have any word exactly like "would".
If anyone knows the difference, please let me know.