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                           general:: 
                           Phrase(s): You never know (what you can do) till you try.  Prov. Even if you think you are not able to do something, you should try to do it.  •  Jill: Want to go rock-climbing with me this weekend? Jane: Oh, I can’t rock-climb. Jill: How do you know? Have you ever tried it? Jane: No, not really. Jill: You don’t know what you can do till you try.  •  Alan: I’ll never be able to learn to dance. Jane: You don’t know till you try.
                           
                           
                           
                           
                        
    
                       
                    
                        
                        
                        
                    
 
                    
                        McGrawhill's American Idioms And Phrasal Verbs