～かもしれません
Something might be true
You'll be able to express a real possibility when you are not certain what is true or what will happen.
鍵を車の中に忘れたかもしれません。
kagi o kuruma no naka ni wasureta kamoshiremasen.
What do you think this sentence means?
I might have forgotten the keys inside the car.
Leave open a possibility
～かもしれません says something may be true. It expresses possibility without committing to a strong prediction.
鍵を忘れたかもしれません。
kagi o wasureta kamoshiremasen.
I may have forgotten my key.
Form and use ～かもしれません
Nouns and な-adjectives omit だ. Past or negative forms can precede it: 忘れたかもしれない, 来ないかもしれない. Avoid interpreting it as a fixed numerical probability.
鍵を忘れたかもしれません。
kagi o wasureta kamoshiremasen.
I may have forgotten my key.
明日は行けないかもしれません。
ashita wa ikenai kamoshiremasen.
I may not be able to go tomorrow.
午後から雨が降るかもしれません。傘を持っていきましょう。
gogo kara ame ga furu kamoshiremasen. kasa o motte ikimashou.
It might rain from the afternoon. Let's take umbrellas.
道が混んでいるので、会議に遅れるかもしれません。
michi ga konde iru node, kaigi ni okureru kamoshiremasen.
The roads are crowded, so I might be late for the meeting.
財布は電車の中に忘れたかもしれません。
saifu wa densha no naka ni wasureta kamoshiremasen.
I might have left my wallet on the train.
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