Some more patter rules help

[PATTON, BILLY \(SBCSI\)]

I have :
define do_sh
$(1)/% : $(2)/%.sh
        @echo "copy $$$$< tp $$$$@"
endef
$(foreach proj,$(PROJECTS),\
  $(foreach bb,$(bb+$(proj)),\
    $(foreach topic,$(topic+$(proj)+$(bb)),\
      $(eval $(call
do_sh,$(PRD_TREE)/$(proj)/$(bb)/bin,$(SRC_TREE)/$(proj)/$(bb)/$(topic)/s
rc)))))


and I get from the echo :
copy $< tp

How do I get the $? and $@ ?
How many times do I need to refreence/derefence