Those are the many reasons for which I won't talk to you anymore.
Those are the many reasons because of which I won't talk to you anymore.
Those are the many reasons why I won't talk to you anymore.
Are these grammatical and synonymous
Since we do something for a reason, the first one ought logically to be correct, and yet to me it does not seem natural. To me, the natural way of saying this is with "why", as in your third example.
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Since we do something for a reason, the first one ought logically to be correct, and yet to me it does not seem natural. To me, the natural way of saying this is with "why", as in your third example.
[1] Those are the many reasons for which I won't talk to you anymore.
[2] Those are the many reasons because of which I won't talk to you anymore.
[3] Those are the many reasons why I won't talk to you anymore.
Yes, they are all grammatical, though the syntax is different.
In [1] "which" is complement of "for, so the relati