associated lists

[Levent Yilmaz]

I have a set of associated pairs. And want to execute some command on 
each pair. Say for example,

# define present-past tense pairs as follows
present_tense = go   do  sit call
past_tense    = went did sat called

# somehow generate this phony command for each pair
# using eval (or by other(?) means)
@echo $(present) today. $(past) yesterday.


What I want to accomplish in effect is simply using $(foreach ...) but 
iterate simultaneously through more than one list...

Any ideas?

thank you
- L.