What is the difference? Hi world! Can anyone help me with one simple question please? Words CHANGE SUBSTITUTE REPLACE sometimes can have the same meaning, can't they? I do realize they are not interchangeable, but I'd like to know what the main difference is. For example I bought a new phone instead of my old one. Does it mean I changed or replaced or substituted my old one? Thanks in advance

Grammar problem Hi everyone! Can anybody explain why in the following example we use Future Perfect Continious? A: It is such a pity that Helen is away and can't watch the match with us. You know how much she loves tennis. B: I am sure she WILL HAVE BEEN WATCHING it on TV in her hotel room. Thanks in advance