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I've noticed that I don't see 〜ましたり used very often, but it does seem to be an
accepted form. I believe this form can be broken down like this:
動詞{どうし}の連用形{れんようけい}＋「ます」の連用形{れんようけい}＋「たり」

My understanding is that normally the sentence-final 動詞{どうし} is the one that
is responsible for indicating the politeness of the sentence, while other
verbs can be made polite depending on "how polite" you want the sentence to
sound (as long as that 動詞{どうし} is not in a relative clause, and not in the
objective clauses of certain verbs).

However, 〜たり makes a 動詞{どうし} nominal, so it is not clear to me when, if ever,
you should use the polite form of the 動詞{どうし} when attaching 〜たり. (On a
potentially related side note, I don't think I ever see the polite form of a
動詞{どうし} when using 中止形{ちゅうしけい} either.)
CC BY-SA 3.0
2013-01-27T21:27:48.307
11061
2013-02-03T06:04:03.487
2013-01-28T01:14:46.577
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3097
question
grammar politeness
When should the polite form of 〜たり be used?
After doing more research, I can't seem to find any modern sentences which use
this form. This means it is most likely the fault of the grammar guides which
include it, as it seems to be constructed rather than something which is
actually used.

So, I think it is safe to say, never use 〜ましたり as a polite form for 〜たり.
CC BY-SA 3.0
2013-02-03T06:04:03.487
11124
2013-02-03T06:04:03.487
3097
11061
answer