先週は忙しかったです。

N5 先週 senshuu last week N5 忙しかった isogashikatta was busy

N5 先 sen / saki, ma.zu before, ahead, previous N4 週 shuu week, semaine, semana N3 忙 bou, mou / isoga.shii, sewa.shii, oso.reru, ureerusama busy, occupied, restless

N5 〜です desu Used at the end of a sentence, polite affirmative form, means to be depending on context N4 〜し shi Indicates multiple reasons or qualities, connects clauses or adjectives, means besides that, and also N5 〜で de Indicates where an action happens, means used, tool, cause, or material depending on context 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