copy current selection

i want to copy the cells where i am
if i am at a3
then a3 value copy just after i select cell d7 to d10
then that rage should copy and just after
if i select e10: f20 then that range should copy
thats all

that means on range select event which code i want to write?
selection.copy=true

no that is not correct

here range a1 and range e1 were specified
but i cant specify the range
i need to copy the cells where i selected

sry that is happend when i press a key or run that macro
i need not run a macro
i need code like this
Private Sub Worksheet_SelectionChange(ByVal Target As Range)
selection.copy
end sub

its happend through mouseclick event
if i select a1 then that will copy
if i select other cells then that cells should copy