1. It's hard to imagine that the world has not always been as we know it today. What does it mean? Because the world is always changing?-- No; because it changes so slowly.
2. People used the tools they had to shape the world around them as we do. What does that mean?-- I can't imagine how to say that more clearly. 'People of all times have used the tools and ideas of t
1.It is hard to believe that the world earlier didnt have the technology etc that we have today. The world earlier was really different from what it is now,
It's hard to imagine that the world has not always been as we know it today.
Aside from my understanding, the grammtical structure "has not always been", been the same, been complicated, been what thing? I thought we should add something after been.