はじめは彼を君の兄さんだと思っていました。
Sentence Analyzer
English Translation
        At first, I took him for your brother.
    
Furigana
        はじめは彼 を君 の兄 さんだと思 っていました。
    
Romanji
        Hajime wa kare o kimi no niisan da to omotteimashita.
    
Words
            
                始め
            
            
                (はじめ)
            
        
        
            beginning; start; outset; opening; first (in line, etc.); origin; such as ...; not to mention ...
        
    
            
                は
            
            
                (は)
            
        
        
            topic marker particle; indicates contrast with another option (stated or unstated); adds emphasis
        
    
            
                彼
            
            
                (かれ)
            
        
        
            he; him; his; boyfriend
        
    
            
                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.
        
    
            
                君
            
            
                (きみ)
            
        
        
            you; buddy; pal; monarch; ruler; sovereign; (one's) master
        
    
            
                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
        
    
            
                兄さん
            
            
                (にいさん、あにさん)
            
        
        
            older brother; elder brother; brother (as older-brother figure in friendly and or work relationship); (vocative) young man; buddy; fella; laddie
        
    
            
                だ
            
            
                (だ)
            
        
        
            be; is; indicates past or completed action; indicates light imperative
        
    
            
                と
            
            
                (と)
            
        
        
            if; when; and; with; particle used for quoting (with speech, thoughts, etc.); quoting particle; promoted pawn; indicates question (sentence end)
        
    
            
                思う
            
            
                (おもう)
            
        
        
            to think; to consider; to believe; to think (of doing); to plan (to do); to judge; to assess; to regard; to imagine; to suppose; to dream; to expect; to look forward to; to feel; to desire; to want; to recall; to remember