Japanese phrase
理由は___です。 ri yū wa ___ de su
Meaning
The reason is ___.
When to use it
States the reason for an action or situation. It clearly gives a cause and is neutral in tone.
Example dialogue
どうして遅れたんですか？ dō shi te oku re ta n de su ka
Why were you late?
理由は電車が遅れたからです。 ri yū wa den sha ga oku re ta ka ra de su
The reason is that the train was delayed.