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There are many usages of もん, but the one I am interested in is using もん to
replace もの (tangible noun). For example:  

`安いもん` (lit translation: cheap stuff) can be used to replace `安いもの`

The question is, can it be used to modify a sentence into a noun in a complex
sentence? For example:

`このナイフは安いもんが結構鋭いわよ` (Notice that the もん modifies the sentence into a noun in a
complex sentence)

If I recall correctly, this is grammatically wrong because もん can only replace
もの if and only if it is at the end of the sentence. For example, the sentence
`このナイフは安いもん` is grammatically correct, but not `このナイフは安いもんが結構鋭いわよ`.

I realize that one will still definitely understand the meaning of the
sentence perfectly well, but is this structure actually ever used?
CC BY-SA 4.0
2020-02-07T15:49:11.790
74298
2020-02-08T04:04:43.210
36603
question
slang
replacing もの (noun) with もん (noun)
You're right that もの(物) "thing" "stuff" can be contracted to もん, eg 安い[物]{もの},
[良]{い}い[物]{もの}, 欲しい[物]{もの} → 安いもん, いいもん, 欲しいもん etc. in colloquial speech,
especially in Kansai.

> このナイフは安いもん

It makes sense, but grammatically speaking it's not a _full_ sentence; to say
"This knife is cheap stuff", you need a copula だ/です at the end.

> このナイフは安い物です。  
>  このナイフは安いもんだ。

... but [安物]{やすもの} would be more common/natural in this case:

> このナイフは安物です。  
>  このナイフは安もんだ。

* * *

> "This knife is cheap stuff, **but** it is pretty sharp"  
>  このナイフは安いもん **が** 結構鋭いわよ。

The conjunctive particle が ("but") should be attached to the terminal form
(終止形) of a verb, adjective, etc., like this:

> このナイフは安物 **です** が、結構鋭いですよ。  
>  このナイフは安物/安もん **だ** が、結構鋭い。

Or more colloquially:

> このナイフ、安もんだけど、結構鋭いわよ。
CC BY-SA 4.0
2020-02-08T03:59:39.277
74317
2020-02-08T04:04:43.210
2020-02-08T04:04:43.210
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answer