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What is the difference between 後ずさった and 後ずさりした as an example, and the difference between past-tense-form-verb and masu-stem-verb + した as general ?

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It's quite hard to answer, so I played at some "corpus linguistics".

I searched on BCCWJ corpus for usages of single verb あとずさる and the combination of あとずさり + [0 or 1 particle] + する. That corpus contains 100 million-ish words from various written materials during 1980s to 2000s.

I got 166 samples of single verb, and 176 of する-compound (some error entries cleared).

Age (writer's year of birth)

enter image description here

Relatively speaking, あとずさり + する seems to be more frequently used by old writers, while あとずさる is more popular among recently born people. The percentage apparently has reversed during WWII. Of course, too young or too old people are small in number because of narrow time range of this corpus.
(The rightmost "0" column represents "unknown".)

Gender

enter image description here

Men use あとずさる about as many times as women, but somehow twice as many in あとずさり + する. I'm pretty surprised as I didn't expect such a clear gender distinction.
(Yellow pies mean "unknown".)

Other not quantitative observations

  • あとずさる appears more in simpler expressions within its own conjugation, such as plain present, plain past, independent te-form etc., whereas あとずさりする is more likely to form complex predicate, as あとずさりしていく, あとずさりしてしまう, or あとずさりして~する "do V stepping back" kind of adverbial expressions.

  • From context, あとずさる seemingly focuses on the doer's internal will or intention reflected on their action, and あとずさりする is more like the movement of backing away itself.

  • Modal expressions can be used together with あとずさりする, such as あとずさりしたい, あとずさりするつもり etc., but no results with あとずさる in the range of the corpus.

  • Negative forms are very rare.

  • A few causative forms seen with あとずさりする, but not あとずさる.


Though the answer couldn't be called well-organized, I hope it would be some help.

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It's the same as 話す and 話する.
後ずさる is a verb and 後ずさり is a noun.
後ずさりする is transforming the noun into a verb, even though there is already a verb made for saying it(後ずさる).

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  • I know that but I wonder there is any subtle difference between them ? – Narutokage Oct 19 '16 at 2:04
  • The difference is the same as between "I back stepped" and "I did a back step" – stack reader Oct 19 '16 at 2:12
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    話する: Did you mean 話をする? – naruto Oct 19 '16 at 2:28
  • Not really... it's quite common to drop the を in does cases, it depends on people. Some verbs tend to drop it more than others. Just like 後ずさりした could probably be wrote 後ずさりをした. I only omitted it to make it similar the the OP's example. – stack reader Oct 19 '16 at 2:42
  • I think "he stepped back" and "he did a step back" feel little different to me. "he stepped back" means something that you did intentionally while "he did a step back" can be felt more like an unnatural step (stumbled), caused by outside force ? – Narutokage Oct 19 '16 at 3:12

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