call Subroutine

hi
if i have Subroutines

sub aaa1()
----
------
end sub



sub aaa2()
-------
-------
end sub



how to call them with sub name & i

i = 1

call "aaa" & i



it gives me error

i used run "aaa" & i it gives me error

i used application.run "aaa" & i it gives me error

thank you very much jindon great