1) I don’t know who else can do it.
2) I am not sure where else you can find it.
3) Tell me how else can I do this
4) Say if anybody else can do this
5) Ask why else they will do it.
1) Let’s go, or else well be late.
2) Let’s begin, or else we wont finish in time.
3) Tell me, or else I go away.
4) Do your homework now or else youll be punished.