Need help with Druid Form ability swap macro

[Belsengar-wyrmrest-accord]

So I have a macro to swap an ability depending which form I am in.

#showtooltip
/cast [form:1] Swipe; [form:2] Shred

What I would like to do is to add a shift modifier to form 2 so I can use Rake while holding Shift in Cat form, but when I’m back in form 1 Bear it does nothing on holding Shift.
I would very much appreciate some guidance from someone who knows more about this wizardry than myself.

[Elvenbane-veknilash (Elvenbane)]

[this, and this]
[this] [or this]

#showtooltip
/cast [mod:shift,form:2] Rake; [form:2] Shred; [form:1] Swipe

[Belsengar-wyrmrest-accord]

Thank you for the explanation! That is extremely helpful!

[Elvenbane-veknilash (Elvenbane)]

If you want some complex practical examples:

Elvenbane's Personal Macros

Below are my personal macros I use for each class/spec. The purpose of them is to condense the number of physical keys you need to press by controlling which spell is cast via modifier (alt/shift/ctrl) and adding enhanced targeting capabilities where applicable. I’ve included the keys I have them bound to but you can use whatever. Important Before using these macros make sure you unbind SHIFT 1-6 (Action Page 1-6) keys in your key bindings. If you don’t, pressing any of the shift modified macr…