1) I am a friend of yours sincerely.
2) Yours sincerely I am.
3) I am yours sincerely.
Correct these sentences grammatically.
1) and 2) sound odd to me. Sorry. :(Originally Posted by Said Badshah
Yours sincerely, is a closing for an informal letter. It has the same meaning as 3) above: I am yours sincerely.
All the best.