a) Were books first printed in the 15th
century? Were books first printed in the 15th or 16th century? Books were first
printed in the 15th century, weren't they?
b) Did printers start printing books in three countries at the same time? Did printers
start printing books in three or five countries at the same time? Printers
started printing books in three countries at the same time, didn't they?
c) Can anyone read books on CDs these days? Can anyone read books on CDs or
DVDs these days? These days anyone can read books on CDs, can't they?
d) Did Columbus discover America five centuries ago? Did Columbus discover
America or Canada five centuries ago? Columbus discovered America five
centuries ago, didn't he?
e) Does the Internet provide us with access to any library all over the world? Does
the Internet provide us with access to any library or museum all over the
world?The Internet provides us with access
to any library all over the world, doesn't it?
f) Did people living in one part of the world not know much about the life of
people in their neighbouring countries not long ago? Did people living in one
part of the world know much or little about the life of people in their
neighbouring countries not long ago? Not long ago people living in one part of
the world didn't know much about the life of people in their neighbouring
countries, did they?