1. Used next to a verb sign to mean the action is done on its own and separately from other actions. English = singly, only, alone, by itself.
2. Used next to a verb sign to mean the action is done by only one person separately from other people and without any help. English = by oneself, alone, individually.
3. Used to introduce a sentence to mean that what follows is an expression of one's own opinion, not necessarily any one else's. English = personally, as for me, as far as I'm concerned, in my opinion, and so on.