彼はもう駅に着いたはずです。

N5 彼 kare he N5 もう mou already / more N5 駅 eki station N4 はず hazu logical expectation, should be

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

N4 〜はずだ hazu da Indicates logical expectation based on known information, attaches to verb adjective or noun, means should or must be N5 〜です desu Used at the end of a sentence, polite affirmative form, means to be depending on context 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 〜で de Indicates where an action happens, means used, tool, cause, or material depending on context N5 〜も mo Means also, adds another similar item, often replaces particles such as wa ga or o N5 〜は wa Marks the topic of the sentence, indicates what the sentence is about, can contrast with another element, organizes main information