a) Agatha Christie lived  from 1890 to 1976.

b) Has Helen ever tried sushi?

c) Did you go to the wedding last night?

d) I have never been to Miami.

e) When I was in Cuba, I saw turtles but I didn't see any lions!

f) Have you finished your homework yet?

g) John didn't call me yesterday.

h) I’m worried… They haven't came back yet.

i) Did he read Harry Potter?

     for a month                                 for  2 years.

     since  1990                                 since 5 o’clock.

     for 3 weeks                                since I met her.

     since April                                  for a long time.

     since this morning                     since their childhood.

      for a day                                     since I was born