彼はもう駅に着いているに違いないから先に行こう

N5 彼 kare he N5 もう mou already / more N5 駅 eki station N5 ている te iru be doing N5 先 saki ahead / previous / destination N4 こう kou like this, this way

N3 彼 hi / kare, kano, ka.no he, that, the N4 駅 eki station, gare, estación N4 着 chaku, jaku / ki.ru, ki.seru, tsu.ku, tsu.keru don, arrive, wear N3 違 i / chiga.u, chiga.i, chiga.eru, -chiga.eru, taga.u, taga.eru difference, differ, différence N5 先 sen / saki, ma.zu before, ahead, previous N5 行 kou, gyou, an / i.ku, yu.ku, -yu.ki, -yuki, -i.ki, -iki, okona.u, oko.nau going, journey, carry out

N4 〜に違いない ni chigai nai Indicates strong certainty based on evidence or deduction, attaches to verb adjective or noun, means must surely be N5 〜ている te iru Indicates ongoing action, continuous state, repeated habit, or resulting condition depending on context N5 〜から kara Indicates cause or reason, equivalent to because or since, connects two clauses explaining reason N5 〜もう mou Indicates recent completion or change, equivalent to already, shows action completed before now 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