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I am trying to understand もの completely but I fail to understand it and mix up
the meanings sometimes. I know that ものだ can mean that you want to emphasis
something you feel etc according to [this
post](https://japanese.stackexchange.com/questions/43083/the-meanings-
of-%E3%82%82%E3%81%AE%E3%81%A0), I've also read that sometimes it almost has
the same meaning as べき, and sometimes to state a fact. According to that post
there are a group for "Advice based on common sense" and one for "General
tendencies and cold facts."

But I can't tell how to translate sentence like this:

子供: 「もう勉強したくないよぉ。」 母:「学生は勉強するものでしょ」

My translation Child: I don't wanna study anymore! Mother: But students
**should** study right? (Advice based on common sense)

OR is it interpreted as  
Child: I don't wanna study anymore! Mother: But students study right? (General
tendencies and cold facts)

Another example

恋人がいれば、楽しくなるものですよ My translation: If I had someone, I would have fun.

Actually after thinking of this sentence, it probably is this group: General
tendencies and cold facts. Also what would be the difference if it was not
written with ものです in the end like 恋人がいれば、楽しくなる?
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meaning
which meaning does ものだ have here?
# Different grammatical usages of もの

The _formal noun_ もの can have a few different meanings and usages. The "Fun
with Grammar" initiative by the Japan Foundation distinguishes two cases
concerning もの, the [first
case](https://www.jpf.go.jp/j/project/japanese/teach/tsushin/grammar/201206.html)
explains the usage of もの at the end of the sentence, whereas the [second
case](https://www.jpf.go.jp/j/project/japanese/teach/tsushin/grammar/201209.html)
explains the usage of もの in the middle of sentence. Since your question falls
within the first category, where もの is used at the end, I will only talk about
that category.

# 1. Four main usages of もの at the end of a sentence

As pointed out in [l'électeur's
answer](https://japanese.stackexchange.com/a/43127/39516), using もの at the end
of the sentence is often used to express these four distinct nuances:

  1. To describe the true nature or an ideal state of something (l'électeur: cold facts)
  2. To express advice, warning or admonition (l'électeur: common sense)
  3. To express admiration or strong feelings for something in general (l'électeur: deep emotion)
  4. To express nostalgic feelings when looking back at life (l'électeur: recollection)

Example sentences:

### True nature

> 人の性格はなかなか変わらないものだ。
>
> People don't easily change.

_The speaker may be speaking from personal experience, noticing a pattern._

### Advice/warning

> 学生はもっと勉強するものだ。
>
> Students should study more.

_The speaker might be a teacher who has noticed a decline in marks over time._

### Admiration/strong feelings

> 人生はすばらしいものだ。
>
> Life is beautiful.

_The speaker carefully assessed their opinion on life, and perhaps concluded
that the positive aspects of life greatly outweigh the negative ones._

### Nostalgia

> あのころは、どこの家でも酒を作っていたものだ。
>
> Back in the day, every household would brew their own sake.

_The speaker was alive back then, and happens to remember that fact._

# 2. Further nuances

While l'électeur's answer touches on the same four usages as the Japan
Foundation's web page, another implied nuance is that the speaker (who uses
もの) is addressing the topic in a more distantiated and indirect way. This in
turn implies that the speaker is trying to be objective. The speaker might
have the relevant expertise to make certain claims, or they might have
assessed a certain topic very carefully before forming an opinion about it. In
order not to repeat the same examples, I have attempted to explain why each
example can be considered objective above in italic.

According to the Japan Foundation, here's when and why もの would be
appropriate:

  1. The speaker has significant experience or knowledge about a topic
  2. The listener is not experienced **OR** the speaker is talking to themselves
  3. The speaker is talking indirectly and/or objectively about the topic
  4. The speaker takes their time to form an opinion, rather than expressing a casual opinion

# 3. To answer your question

This もの（だ・です） construction has a rather serious and reflective tone, which
does not easily lend itself to casual conversation. In the first conversation
between the student and their mother, this tone is appropriate. The mother,
much like any parent, wants to make sure her child studies hard and admonishes
them when she fears that her child will not do well in school.

For the second example, I'm assuming you're reflecting about how you think
your life would be if you had a lover. This is also an appropriate scenario to
use もの. However, if you were casually talking to someone about being in a
relationship, then that same sentence could come off as cold or even as
patronising.

As an aside, when you're talking to yourself, you don't have to use the polite
form です or the particle よ.

Hope this helps!
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