事故の原因は警察が捜査中だった。
Sentence Analyzer
English Translation
        The cause of the accident was being investigated by the police.
    
Furigana
Romanji
        Jiko no gen'in wa keisatsu ga sōsachū datta.
    
Words
            
                事故
            
            
                (じこ、ことゆえ)
            
        
        
            accident; incident; trouble; circumstances; reasons
        
    
            
                の
            
            
                (の)
            
        
        
            indicates possessive; nominalizes verbs and adjectives; substitutes for "ga" in subordinate phrases; (at sentence-end, falling tone) indicates a confident conclusion; (at sentence-end) indicates emotional emphasis; (at sentence-end, rising tone) indicates question
        
    
            
                原因
            
            
                (げんいん)
            
        
        
            cause; origin; source
        
    
            
                は
            
            
                (は)
            
        
        
            topic marker particle; indicates contrast with another option (stated or unstated); adds emphasis
        
    
            
                警察
            
            
                (けいさつ)
            
        
        
            police; police officer; police station
        
    
            
                が
            
            
                (が)
            
        
        
            indicates sentence subject (occasionally object); indicates possessive (esp. in literary expressions); but; however; still; and
        
    
            
                だ
            
            
                (だ)
            
        
        
            be; is; indicates past or completed action; indicates light imperative
        
    Kanji
Readings: ジ、 ズ、 こと、 つか.う、 つか.える
                        Meanings: matter, thing, fact, business, reason, possibly
                    Readings: コ、 ゆえ、 ふる.い、 もと
                        Meanings: happenstance, especially, intentionally, reason, cause, circumstances, the late, therefore, consequently
                    Readings: ゲン、 はら
                        Meanings: meadow, original, primitive, field, plain, prairie, tundra, wilderness
                    Readings: イン、 よ.る、 ちな.む
                        Meanings: cause, factor, be associated with, depend on, be limited to
                    Readings: ケイ、 いまし.める
                        Meanings: admonish, commandment
                    Reading: サツ
                        Meanings: guess, presume, surmise, judge, understand
                    Readings: ソウ、 シュ、 シュウ、 さが.す
                        Meanings: search, look for, locate
                    Reading: サ
                        Meaning: investigate
                    Readings: チュウ、 なか、 うち、 あた.る
                        Meanings: in, inside, middle, mean, center