ツバメは夏の前触れだ。
Sentence Analyzer
English Translation
        The swallow is a sign of summer.
    
Furigana
        ツバメは夏 の前触 れだ。
    
Romanji
        Tsubame wa natsu no maebure da.
    
Words
            
                燕
            
            
                (つばめ、つばくらめ、つばくら、つばくろ、ツバメ)
            
        
        
            swallow (bird of the Hirundinidae family); martin; barn swallow (Hirundo rustica); younger man involved with an older woman
        
    
            
                は
            
            
                (は)
            
        
        
            topic marker particle; indicates contrast with another option (stated or unstated); adds emphasis
        
    
            
                夏
            
            
                (なつ)
            
        
        
            summer
        
    
            
                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
        
    
            
                前触れ
            
            
                (まえぶれ)
            
        
        
            previous notice; herald; harbinger; portent; advance warning
        
    
            
                だ
            
            
                (だ)
            
        
        
            be; is; indicates past or completed action; indicates light imperative