僕(ぼく) bokuの noペン penが gaない naiなぁ naa。 I can't find my pen. emotionsdaily lifeない (non-existence)sentence-final な (reflective)masculine first-person pronoun (僕)
忘(わす)れ()物(もの) wasuremonoない nai？ Got everything? daily lifeeveryday conversationない (non-existence)particle omissioncasual yes/no question (no か)
忙(いそが)し()く()て() isogashikute遊(あそ)ぶ() asobuひま himaが gaない nai。 I'm too busy to have time to play. timedaily life~て form (chaining)~暇がない (no time to)ない (non-existence)