Japanese phrase
原因は___だと思います。 gen in wa ___ da to omo i ma su
Meaning
I think the cause is ___.
When to use it
Expresses a tentative belief about what caused a problem. The wording is polite and avoids sounding certain when the reason is unclear.
Example dialogue
電車が遅れたのはなぜですか？ den sha ga oku re ta no wa na ze de su ka
Why was the train delayed?
原因は信号の故障だと思います。 gen in wa shin gō no ko shō da to omo i ma su
I think the cause was a signal problem.