What is the purpose of もの in this sentence?


In the sentence

> user3856370は鬼のおなかの中を、針の刀でちくちくと刺したものだから、鬼はたいへんです。

What is the purpose of ものだ? It seems to me that ...刺したから... (because he
stabbed) would work on its own. I could also imagine that ...刺したのだから... might
work where the のだ is the explanatory-の thing. But I can't make sense out of
the whole ...刺したものだから... construction.

PS. I didn't really stab the ogre but I couldn't find the right kanji for the
correct name.




In meaning, 「ものだから」＝「ので」 and the two are interchangeable. Both express a
reason or cause.

I would recommend that you learn 「ものだから」 as a unit, but if you have to parse
it, it is like this:

「もの」 is a dummy noun. It is needed to connect 「[刺]{さ}した」 and 「だ」grammatically.

「だ」 is an affirmation auxiliary verb.

「から」 is a conjunctive particle.

Thus, 「[刺]{さ}したものだから」 means the exact same as 「刺したので」 -- "because (someone)
stabbed".

Needless to say, 「も **の** だから」 is often pronounced as 「も **ん** だから」 in
colloquial speech. Additionally, one might also need to know that 「ものだから」 is
already fairly informal to begin with. It is definitely more informal than
「ので」.




In meaning, 「ものだから」＝「ので」 and the two are interchangeable. Both express a
reason or cause.

I would recommend that you learn 「ものだから」 as a unit, but if you have to parse
it, it is like this:

「もの」 is a dummy noun. It is needed to connect 「[刺]{さ}した」 and 「だ」grammatically.

「だ」 is an affirmation auxiliary verb.

「から」 is a conjunctive particle.

Thus, 「[刺]{さ}したものだから」 means the exact same as 「刺したので」 -- "because (someone)
stabbed".

Needless to say, 「も **の** だから」 is often pronounced as 「も **ん** だから」 in
colloquial speech. Additionally, one might also need to know that 「ものだから」 is
already fairly informal to begin with. It is definitely more informal than
「ので」.

