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would

would /ˈwʊd/ /wəd/ /əd/ verb
would
/ˈwʊd/ /wəd/ /əd/
verb
Britannica Dictionary definition of WOULD
[modal verb]
used to indicate what someone said or thought about what was going to happen or be done
used to talk about a possible situation that has not happened or that you are imagining
used with have to talk about something that did not happen or was not done
used to say what you think someone should do or to ask for someone's opinion about what to do
used to say that you want to do or have something
used to ask a polite question or to make a polite request, offer, invitation, etc.
used to say that you are willing to do something
used in negative statements to say that someone was not willing to do something
used to express a wish
used to express your opinion
10 
used to talk about something that always or often happened in the past
11 
used with so (that) to explain why something was done
12 
used to say what you think is probably true
13 
used to say that something is possible or likely
14 
used to express your displeasure with behavior that you think is typical of someone
15 
old-fashioned + literary used to say that you wish something was true, had happened, etc. usually + that

how would I/we know

used to say that you do not know the answer to a question and are surprised that you were asked it