gives the reason behind an action or a decision: "on the grounds that", "for the reason that". The reason in front of it is a plain-form clause or a noun, and the outcome follows.
、。
I took the day off work on the grounds that I wasn't feeling well.
、。
That road was closed on the grounds that it was dangerous.
、。
I canceled the trip because of illness.
A な-adjective or a noun takes だ before という, or nothing at all. It never takes な.
という理由で or から
and
just give a cause. という理由で names the reason as one that was stated – the reason someone gave, or the one behind an official decision – so it sits in news reports, notices and explanations rather than in casual talk. Because it quotes the reason, it can also hint that the reason is only an excuse.
、。
The game was called off on the grounds that it was raining.
、。
I always get turned down, supposedly because they're busy.
Usage notes
These go beyond the basic form.
Just because: という理由だけで
With , the reason is too small to justify what follows. The sentence usually ends in a judgment such as or a complaint.
、。
It's not good to quit a job just because it isn't interesting.
という理由から and という理由により
can replace で with no change in meaning.
is stiffer still and belongs to written notices.
、。
This area was chosen on the grounds that it is safe.
、。
This facility was closed on the grounds that its equipment was old.
Lingaku