Please explain the usage of who and whom in such cases.
Who are you talking to or with.
Whom are you talking to or with.
Who are you waiting for.
Whom are you waiting for.
I saw many posts on google but those are unclear to me. Please explain.
All your sentences need question marks. "whom" is technically correct in those sentences as it is the implied object of the prepositions. However, the word "whom" is used only in formal English.
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All your sentences need question marks.
"whom" is technically correct in those sentences as it is the implied object of the prepositions. However, the word "whom" is used only in formal English. In everyday English people use "who" instead. Many native speakers probably go their whole lives without ever using the word "whom".
The only (I think) time you cannot directly replace "who