Page 435 - Makino,Tsutusi.DictionaryOfIntermediateJGrammar

males and females to draw the hearer's attention to something. (See
Related Expression III.)

2. Note that when a Wh-word is used with sa, the predicate part has to be
no-nominalized. The non-nominalized version is totally unacceptable.
(1) E5 LT%B&LC?b>Gff2bl I*P /(DPI, (=KS@))

(2) ABS7Tb>b I*8 /(D81, (=Ex.(i)-B)

I. All the uses of sa in the KS and Exs. can be replaced by yo.

Note that [3] and [4] will change to strictly female speech, because yo
is attached to a noun or to a nominalized clause, respectively, but other
than that the crucial difference is that sa is far more informal than yo.
That is why yo can be connected with both informal and formal forms =
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but sa can be connected only with informal forms. - 18
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[S] a. A: %%kT$&*Q,
B: B%$T {&/*$I, (cf.KS(A))
b. A: B;GiB$%, %tbQblk;ta,
B: bl?, ?%tb$T Ik/*Pl, (cf.KS(B))
c. A&tkEb>Ea) k 5 Q & 0T.f I& / *P I, (cf. KS(C))
Wh-word - yolsa is always connected with informal forms, so there is
no contrast between yo and sa.