3 added 24 characters in body; edited tags
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I've many times heard this phrase "it wasn't me" here:

It wasn't me

Here the case of me is accusative in. In that case should we say "it wasn't us"

It wasn't us

if the agent is plural?

I've many times heard this phrase "it wasn't me" here the case of me is accusative in that case should we say "it wasn't us" if the agent is plural?

I've many times heard this phrase:

It wasn't me

Here the case of me is accusative. In that case should we say

It wasn't us

if the agent is plural?

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2 As per comments on question and on one answer, it's accusative rather than dative
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I've many times heard this phrase "it wasn't me" here the case of me is dativeaccusative in that case should we say "it wasn't us" if the agent is plural?

I've many times heard this phrase "it wasn't me" here the case of me is dative in that case should we say "it wasn't us" if the agent is plural?

I've many times heard this phrase "it wasn't me" here the case of me is accusative in that case should we say "it wasn't us" if the agent is plural?

1
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If it is "it wasn't me" then is it "it wasn't us"?

I've many times heard this phrase "it wasn't me" here the case of me is dative in that case should we say "it wasn't us" if the agent is plural?