私は誰かがドアをノックするのを聞いた。
Sentence Analyzer
English Translation
        I heard someone knock on the door.
    
Furigana
Romanji
        Watashi wa dare ka ga doa o nokkusuru no o kiita.
    
Words
            
                私
            
            
                (わたし、わたくし)
            
        
        
            I; me; private affairs; personal matter; secrecy; selfishness
        
    
            
                は
            
            
                (は)
            
        
        
            topic marker particle; indicates contrast with another option (stated or unstated); adds emphasis
        
    
            
                誰
            
            
                (だれ、たれ、た)
            
        
        
            who
        
    
            
                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
        
    
            
                が
            
            
                (が)
            
        
        
            indicates sentence subject (occasionally object); indicates possessive (esp. in literary expressions); but; however; still; and
        
    
            
                ドア
            
            
                (ドア)
            
        
        
            door (Western-style)
        
    
            
                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.
        
    
            
                ノック
            
            
                (ノック)
            
        
        
            knock; knocking; fungo hitting; hitting balls for fielding practice
        
    
            
                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
        
    
            
                聞く
            
            
                (きく)
            
        
        
            to hear; to listen (e.g. to music); to ask; to enquire; to query; to learn of; to hear about; to follow (advice); to comply with; to smell (esp. incense); to sample fragrance