96831
Example:

引っ越す

引っ越しします

I know they have the same meaning but what are the small details? I remember
seeing the structure お+verb stem+する used in humble speech, but here the お is
omitted.
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2022-10-23T23:31:09.443
96829
2022-10-24T02:24:59.497
54652
question
word-choice verbs politeness
verb stem+masu vs verb stem+suru
You are confusing a noun for a verb.

  * 引っ越す - verb in dictionary form
  * 引っ越します - verb in masu form + ます
  * 引越しします - noun which derived from masu-form + し(する in masu-form) + ます

In school grammar, this is called 連用形の名詞化 (nominalization of te/masu-form).
引っ越し is certainly a masu-form, but it can also be a noun on its own. (BTW 引っ越し
can't be called a stem; its negative form is 引っ越さない.)

The complication is that not all verbs can be turned into nouns in this way,
and you must look up dictionaries whether or not it is an accepted nominal
form.

* * *

For example, the equivalent to above of 起きる is 起き, but this by itself is not a
noun and ×起きします is not acceptable. On the other hand, 早起き is a totally common
word and 早起きします means _(I) wake up early_.

* * *

[This](https://japanese.stackexchange.com/q/89159/45489) contains a bit more
details.
CC BY-SA 4.0
2022-10-24T02:24:59.497
96831
2022-10-24T02:24:59.497
45489
96829
answer