いつ時計がないことに気がつきましたか。
Sentence Analyzer
English Translation
        When did you miss your watch?
    
Furigana
        いつ時計 がないことに気 がつきましたか。
    
Romanji
        Itsu tokei ga nai koto ni kigatsukimashita ka.
    
Words
            
                何時
            
            
                (いつ)
            
        
        
            when; how soon
        
    
            
                時計
            
            
                (とけい、ときはかり)
            
        
        
            watch; clock; timepiece
        
    
            
                が
            
            
                (が)
            
        
        
            indicates sentence subject (occasionally object); indicates possessive (esp. in literary expressions); but; however; still; and
        
    
            
                無い
            
            
                (ない)
            
        
        
            nonexistent; not being (there); unpossessed; unowned; not had; unique; indicates negation, inexperience, unnecessariness or impossibility; not ...; to not be...; to have not ...
        
    
            
                事
            
            
                (こと、こん)
            
        
        
            thing; matter; incident; occurrence; event; something serious; trouble; crisis; circumstances; situation; state of affairs; work; business; affair; after an inflectable word, creates a noun phrase indicating something the speaker does not feel close to; nominalizing suffix; pretending to ...; playing make-believe ...; alias; aka; nickname; alternative name; also known as
        
    
            
                に
            
            
                (に)
            
        
        
            at (place, time); in; on; during; to (direction, state); toward; into; for (purpose); because of (reason); for; with; by; from; as (i.e. in the role of); per; in; for; a (e.g. "once a month"); and; in addition to; if; although
        
    
            
                気がつく
            
            
                (きがつく)
            
        
        
            to notice; to become aware; to perceive; to realize; to realise; to be scrupulous; to be attentive; to recover consciousness; to come to oneself
        
    
            
                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