彼はもう家に帰ったかもしれません。

N5 彼 kare he N5 もう mou already / more N5 家 ie house / home N4 もし moshi if, in case, supposing

N3 彼 hi / kare, kano, ka.no he, that, the N4 家 ka, ke / ie, ya, uchi house, home, family N4 帰 ki / kae.ru, kae.su, oku.ru, totsu.gu homecoming, arrive at, lead to

N4 〜かもしれない kamoshirenai Indicates uncertain possibility, attaches to verb adjective or noun, means maybe or it may be that N5 〜ます masu Used at the end of verbs, polite present or future form, makes the sentence more polite N5 〜もう mou Indicates recent completion or change, equivalent to already, shows action completed before now N4 〜し shi Indicates multiple reasons or qualities, connects clauses or adjectives, means besides that, and also N5 〜に ni Indicates destination, target, arrival point, specific time, or person receiving an action N5 〜も mo Means also, adds another similar item, often replaces particles such as wa ga or o N5 〜か ka Marks a question, alternative, or uncertainty, appears at the sentence end or between options N5 〜は wa Marks the topic of the sentence, indicates what the sentence is about, can contrast with another element, organizes main information