[Orgmode] sexp in org remember templates

[Richard Riley]

Not being much of an elisp programmer and just returning to try and
integrate with org-learn a little :-

This 

              ("vocab"?v "* Learn TODO %(format '%s' rgr/orig-word)
              :VOCAB:\n:PROPERTIES:\n:orig:\t%(format '%s'
              rgr/orig-word)\n:trans:\t%(format '%s'
              rgr/trans-word)\n:END:%!" nil bottom nil)

fails me by outputting:

,----
| * Learn TODO [Error: (wrong-type-argument stringp %s)]                      
:VOCAB:
| :PROPERTIES:
| :orig:        %![Error: (wrong-type-argument stringp %s)]
| :trans:       %![Error: (wrong-type-argument stringp %s)]
| :END:%!
`----

both rgr/orig-word and rgr/trans-word are set as strings.

Q1 : can I use an elisp var directly as opposed to simulating a func like
above?
Q2 : What is wrong with the above? Whats wrong with that format of a
sexp?
Q3 : how can I specify in the template to auto schedule a TODO for "n"
days in advance?