彼らの大部分が高校生だった。
Sentence Analyzer
English Translation
        They were for the most part high school students.
    
Furigana
Romanji
        Karera no dai bubun ga kōkōsei datta.
    
Words
            
                彼ら
            
            
                (かれら)
            
        
        
            they (usually male); them
        
    
            
                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
        
    
            
                大
            
            
                (おお)
            
        
        
            big; large
        
    
            
                部分
            
            
                (ぶぶん)
            
        
        
            portion; section; part
        
    
            
                が
            
            
                (が)
            
        
        
            indicates sentence subject (occasionally object); indicates possessive (esp. in literary expressions); but; however; still; and
        
    
            
                高校生
            
            
                (こうこうせい)
            
        
        
            senior high school student
        
    
            
                だ
            
            
                (だ)
            
        
        
            be; is; indicates past or completed action; indicates light imperative
        
    Kanji
Readings: ヒ、 かれ、 かの、 か.の
                        Meanings: he, that, the
                    Readings: ダイ、 タイ、 おお-、 おお.きい、 -おお.いに
                        Meanings: large, big
                    Readings: ブ、 -べ
                        Meanings: section, bureau, dept, class, copy, part, portion, counter for copies of a newspaper or magazine
                    Readings: ブン、 フン、 ブ、 わ.ける、 わ.け、 わ.かれる、 わ.かる、 わ.かつ
                        Meanings: part, minute of time, segment, share, degree, one's lot, duty, understand, know, rate, 1%, chances, shaku/100
                    Readings: コウ、 たか.い、 たか、 -だか、 たか.まる、 たか.める
                        Meanings: tall, high, expensive
                    Readings: コウ、 キョウ
                        Meanings: exam, school, printing, proof, correction
                    Readings: セイ、 ショウ、 い.きる、 い.かす、 い.ける、 う.まれる、 うま.れる、 う.まれ、 うまれ、 う.む、 お.う、 は.える、 は.やす、 き、 なま、 なま-、 な.る、 な.す、 む.す、 -う
                        Meanings: life, genuine, birth