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A few minutes ago, walking back from lunch, I started to cross the street when I heard the sound ...

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have walked    had walked    walked    have been walking  
have walked    had walked    walked    have been walking  
was    is    will be    would be  
have walked    had walked    walked    have been walking  
arrives    arrived   arriving   had arrived  
have walked    had walked    walked    have been walking  
plays    to play    playing    played  
have walked    had walked     walked    have been walking  
mustn’t    can’t    shouldn’t    may not  
mustn't  can't  shouldn't  may not  
have walked    had walked    walked    have been walking  
have walked    had walked    walked    have been walking  
have walked  had walked  walked  have been walking  
have walked  had walked  have been walking  walked  
leave    leaves    to leave    left  
mustn’t    can’t    may not    isn’t able to  
have walked   had walked     walked   have been walking  
mustn''t    shouldn''t    can''t    may not  
plays    to play    playing    played  
have walked   had walked  have been walking   walked  

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