I'm learning Japanese and using busuu. A native speaker corrected my exercise
but I dont understand what the green corrections mean. They teach me vocab and
not much grammar. Please help!![enter image description
here](https://i.stack.imgur.com/QkrHe.jpg)
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question
counters kinship-terms
what does 人の　mean?
人 is a person, but the word you're looking at is 一人, pronounced ひとり. It's made
up of the kanji ー for "one" and 人 for "person", and it means "one person.” In
this case,

> 一人のむすめ

means "one daughter."

Also note that in the same sentence:

> 二人のおとうと

The 二人 is pronounced ふたり and means "two (people)".
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answer
In Japanese it is required that you add a counter word to virtually any
number. Just “一” by itself has little practical meaning; _one-what exactly?_

This is a somewhat foreign concept in English, but is not without precedent.
For instance, you need to say “one _sheet of_ paper”. Just “one paper” can be
understood, but can also be misunderstood and sounds unnatural at the very
least. The thing in Japanese is that you need something like “sheet of” for
_everything_ , even where it might sound redundant in English.

  * 紙一枚: one sheet of paper, 枚 counts flat things
  * 車一台: one car, 台 counts machines
  * りんご一個: one apple, 個 counts smallish roundish things
  * 一人: one person, 人 counts people and means “person”

And yes, the list of counter words is [sheer
endless](https://en.wikipedia.org/wiki/Japanese_counter_word#Common_counters_by_category).

The thing specifically with 一人 is that it can also mean “lonely” or “only”,
and the correct construction for “one daughter” is 娘一人 or, if you turn it
around, 一人の娘. Just 一人娘 would mean something like “only daughter”.
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answer