なぜ彼が自殺をしたかはいまだに謎である。
Sentence Analyzer
English Translation
        Why he killed himself is still a mystery.
    
Furigana
        なぜ彼 が自殺 をしたかはいまだに謎 である。
    
Romanji
        Naze kare ga jisatsu o shita ka wa imadani nazo de aru.
    
Words
            
                何故
            
            
                (なぜ、なにゆえ)
            
        
        
            why; how
        
    
            
                彼
            
            
                (かれ)
            
        
        
            he; him; his; boyfriend
        
    
            
                が
            
            
                (が)
            
        
        
            indicates sentence subject (occasionally object); indicates possessive (esp. in literary expressions); but; however; still; and
        
    
            
                自殺
            
            
                (じさつ)
            
        
        
            suicide
        
    
            
                を
            
            
                (を)
            
        
        
            indicates direct object of action; indicates subject of causative expression; indicates an area traversed; indicates time (period) over which action takes place; indicates point of departure or separation of action; indicates object of desire, like, hate, etc.
        
    
            
                為る
            
            
                (する)
            
        
        
            to do; to cause to become; to make (into); to turn (into); to serve as; to act as; to work as; to wear (clothes, a facial expression, etc.); to judge as being; to view as being; to think of as; to treat as; to use as; to decide on; to choose; to be sensed (of a smell, noise, etc.); to be (in a state, condition, etc.); to be worth; to cost; to pass (of time); to elapse; verbalizing suffix (applies to nouns noted in this dictionary with the part of speech "vs"); creates a humble verb (after a noun prefixed with "o" or "go"); to be just about to; to be just starting to; to try to; to attempt to
        
    
            
                か
            
            
                (か)
            
        
        
            indicates a question (sometimes rhetorical); or; whether or not; some- (e.g. something, someone); indicates doubt, uncertainty, etc.; emphatic prefix; suffix forming adjectives or adverbs; in that way
        
    
            
                は
            
            
                (は)
            
        
        
            topic marker particle; indicates contrast with another option (stated or unstated); adds emphasis
        
    
            
                未だに
            
            
                (いまだに)
            
        
        
            still; even now; until this very day
        
    
            
                謎
            
            
                (なぞ)
            
        
        
            riddle; puzzle; enigma; mystery; enigmatic; mysterious
        
    
            
                だ
            
            
                (だ)
            
        
        
            be; is; indicates past or completed action; indicates light imperative
        
    
            
                或
            
            
                (ある)
            
        
        
            a certain ...; some ...