Page 463 - Makino,Tsutusi.DictionaryOfIntermediateJGrammar

shidai 389
the former expresses a planned sequence of two actions, whereas the
latter can express any kind of sequence of two actions. Examples in [I]
and [2] show that both forms can be used to express a planned sequence
and those in [3] show that Vmasu shidai cannot be used in a non-
planned non-controllable sequence. In this case -tam sugu is much
better than shidai, but slightly marginal and should be replaced by -tam
marnonaku.

b. f$U.k%b: {fT9k%H&tc< /f79t:%b<'/*%T3R%l
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(As soon as he got to Japan he got ill.) -
-
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N shidai da in KS(C) and Exs.(g) - (j) can be replaced by N ni yoru, as
shown in [4].

But not all cases of N ni yoru can be replaced by N shidai da, because
the former has a wider meaning: N ni yoru indicates 'cause' for s.t. as in
[5a], 'means' as in [5b], or 'source' as in [%I. N ni yoru cannot be