Four Jobs, Decided by Context
によって is one of the busiest patterns at N3. All four uses share the idea "it comes down to this".
1. Depending on — the outcome varies with it.
- 人によって意見が違う。(Opinions differ from person to person.)
2. Agent of a passive — who did it.
- この絵はピカソによって描かれた。(This was painted by Picasso.)
3. Means — how it was done.
- 話し合いによって解決した。(It was settled through discussion.)
4. Cause — formal written register.
- 地震によって建物が倒れた。(Buildings collapsed due to the earthquake.)
Telling Sense 1 From the Rest
Sense 1 almost always sits with a verb of difference or variation — 違う, 異なる, 変わる. If you see one of those, read "depending on".
による Before a Noun
- 地震による被害(damage caused by the earthquake)
Not によると
によると cites a source and needs a hearsay ending. によって does none of that. The two differ by one syllable and share no meaning.
