Student or Learner
In the steady barrage of images that make up the digital age, it's almost impossible to fathom a time when photographs of people were nonexistent. But rest assured, kids, that such a time did exist -- and it really wasn't that long ago in the grand scheme of things
What do black lines mean?
How could you link rest assured with you can believe me ? Can you explain me please?
Rest assured = remain in a state of assurance of the truth = be confident that this is true = you can completely believe this to be true
I'm not a teacher, but I write for a living. Please don't ask me about 2nd conditionals, but I'm a safe bet for what reads well in (American) English.