かもしれません

かもしれません kamoshiremasen

かもしれません (kamoshiremasen) is also used to express the speaker's inference or guess about what may possibly happen, though he or she cannot be absolutely certain.

When the speaker says かもしれません (kamoshiremasen), he or she is also aware that the opposite could be true. The degree of certainty is much lower than that of でしょう (deshou) in this case.

Both Japanese expressions share the same sentence patterns. So following that of でしょう (deshou), the sentence patterns of かもしれません (kamoshiremasen) are...

Verb plain-form	かもしれません
い-adjective plain-form	かもしれません
な-adjective plain-form (～だ)	かもしれません
Noun plain-form (～だ)	かもしれません

Note: For な-adjective & noun, remove the ending だ before かもしれません

Examples

1.	約束の時間に間に合わないかもしれません。 yakusoku no jikan ni maniawanai kamoshiremasen Meaning: We might not be in time for the appointment.
2.	東京は今日寒いかもしれません。 toukyou wa kyou samui kamoshiremasen Meaning: It might be cold in Tokyo today.
3.	山田さんは田中さんが好き だ かも知れません。 yamada san wa tanaka san ga suki da kamoshiremasen Meaning: There is a possibility that Mr Yamada likes Ms Tanaka.
4.	鈴木さんの部屋は電気がついていません。もう部屋にいないかもしれません。 suzuki san no heya wa denki ga tsuite imasen. mou heya ni inai kamoshiremasen Meaning: The light in Mr Suzuki's room is off. He might have left his room already.
5.	もしかしたら3月に卒業できないかもしれません。 moshikashitara san gatsu ni sotsugyou dekinai kamoshiremasen Meaning: There is a possibility that I might be unable to graduate in March.
6.	大きい地震があるかもしれませんから、旅行の前に保険に入ろうと思っています。 ookii jishin ga aru kamoshiremasen kara, ryokou no mae ni hoken ni hairou to omotte imasu Meaning: There is a possibility of a big earthquake, therefore I am thinking of getting the insurance before my trip.

Some Points to Note

1. In example 6, if I were to say 大きい地震があるでしょうから (ookii jishin ga aru deshou kara), it will sound very weird. It's like I am predicting and are 90% sure that there will be a big earthquake happening and therefore I have to get the insurance.

Although we can't really predict whether an earthquake is going to happen, there is still a possibility that it may happen. However the possibility is very much lower (may be 1% or lower). In this case, かもしれません (kamoshiremasen) is more appropriate.

2. The adverb もしかしたら (moshikashitara), which means "perhaps", is used quite often with かもしれません (kamoshiremasen), just like in example 5 above.

3. かもしれない (kamoshirenai) is the plain-form of かもしれません (kamoshiremasen).