It's hard to tell!3Q

It's hard to tell!3Q it's hard to tell~ It’s really hard to tell you I’m It’s really hard to tell you I’m It’s really hard to tell you I’m it's hard to “It's hard to die. It‘s a long road .And it‘s hard as hell .Tell me what do you do To survive It's raining hard outside.里的hard是什么用法?3Q It's hard to comments to me. It`s blowing hard outside.Tell him ( )the window i regret to tell you this,but...i regret to tell you this,but i broke the window.为什么要用but.还有一个.it's hard work climbing mountains.it's hard work后加doing Cause it's hard for me to lose In my life I've found only time will tell It's hard to tell that the world we live in is either a reality or a dream 英语.It's hard to tell that the world we live in is either a reality or a dream it's hard to make living It's hard to die怎么解释? It's hard to study English.