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In a recent class, my Japanese teacher taught me the use of しも as something
akin to a formal version of でも as in the following sentences:

  * いつでも暇{ひま}じゃないんですよ。
  * いつしも暇{ひま}じゃないんですよ。

I was told the above sentences have the same meaning, varying only with
formality.

Now, when she wanted me to practice using しも, she gave an example that uses it
in a completely different way from what she explained. She gave the following
sentence:

母{はは}の考{かんが}えが必{かなら}ずしも正{ただ}しいとはかぎらない。

I understand the meaning. But I don't particularly understand what the use of
しも is in this sentence. For me, the meaning stays the same whether or not しも
is there (though this might only be because I don't really get it). My teacher
explained it simply as an emphasis and told me I should try making sentences
using しも like this on my own. But I don't see how I can try making up
sentences when I don't really understand what it's for. No matter how much I
search for しも, there is no explanation for it used as an "emphasis".

I tried searching about 必ずしも and I found results saying it means "not always
(necessarily)" and that makes sense. Does this mean then that しも acts as some
sort of negation? If so, is it just attached to adverbs? How is it
formed/used? If not, what is it then?
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2017-03-20T10:19:45.267
44663
2017-03-20T16:13:27.973
2017-03-20T16:13:27.973
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question
words usage nuances syntax expressions
What is the meaning of しも?
I'm afraid to say that いつしも is very rare, and you can use it naturally only in
literary sentences. ～しも was [a grammatical element in archaic
Japanese](http://kobun.weblio.jp/content/%E3%81%97%E3%82%82) (it was a kind of
intensifier similar to _nothing but_ , _even_ , _necessarily_ , etc), but in
modern Japanese it's not possible to combine an arbitrary word with it.

You will find しも only in the following fixed expressions.

  * [必ずしも](http://www.jgram.org/pages/viewOne.php?tagE=kanarazushimo)(～ない)
  * [まだしも](http://www.jgram.org/pages/viewOne.php?tagE=madashimo)
  * [折しも](http://jisho.org/word/%E6%8A%98%E3%81%97%E3%82%82)
  * [誰しも](http://jisho.org/word/%E8%AA%B0%E3%81%97%E3%82%82) (emphatic version of 誰も)
  * なきにしもあらず: [see this question](https://japanese.stackexchange.com/q/42718/5010)

These are relatively common, and basically it's better to memorize them
individually. The usages are hard to generalize.

いつしも is a rare emphatic version of いつも. Actually, it's so uncommon that I had
to google to check if it is really used in modern Japanese (FWIW there is zero
result in [BCCWJ](http://pj.ninjal.ac.jp/corpus_center/bccwj/en/)). There are
even rarer words like いましも, なおしも, and さしも, but these are just emphatic
variations of いま, なお,
さ([=そう](https://japanese.stackexchange.com/a/43302/5010)), respectively.
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2017-03-20T11:01:49.990
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2017-03-20T11:01:49.990
2017-04-13T12:43:44.863
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answer