For such questions I practice a simple method- ask your self questions?
Who could say? Of course you will say- "he could say" or if the questions is "Who has done this?- of course you will say "he has done this/that?
So, try to imagine this sentence as- " I know that I (not me) am the thief and only he (not him) could say/know that".
Also, try saying " me was the thief" & "I was the thief"? Which one of them sounds better? of course the second
...
Who could say? Of course you will say- "he could say" or if the questions is "Who has done this?- of course you will say "he has done this/that?
So, try to imagine this sentence as- " I know that I (not me) am the thief and only he (not him) could say/know that".
Also, try saying " me was the thief" & "I was the thief"? Which one of them sounds better? of course the second
...
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