Page 424 - Makino,Tsutusi.DictionaryOfIntermediateJGrammar

350 Relative Clause

1. The example of relative clauses given in this entry are all different from
those of ordinary relative clauses in that one of the two source sentences
includes a topic marker wa which carries a conditional meaning. Take
KS, for example: it apparently comes from (la) and (lb).

(1) a. Ab;fQbl,
(There isn't medicine.)
<
b. ?a)%MBfi9.1
(If you take the medicine, you will become smart. (lit. As
for the medicine, one will become smart.))
(lb) is a grammatical sentence, meaning 'if you take the medicine you
will become smart.' So (lb) is the same as (2) in which the conditional
conjunction ba is overtly used.
(2) ?a)%%&&i& 3w.l < aao
(If you take the medicine, you will become smart.)
Because the verb nornu is missing in KS, it looks as though medicine
itself becomes smart. The same explanation is possible with the other
example sentences.

Since a Japanese relative clause can contain a conditional clause within