Past simple sau past continuous:
Are you sure you(dial)..... the right number?
Of course, I am. I (try)..... four times. The line(be)....busy all the time. I(think).... your telephone(be)..... out of order
Oh, now I remember. I(leave).... the receiver off the hook
I(write).... some letters and (not want)....to be disturbed.But why(you call)....me?
I(want)...to go for a walk. I(wonder)....if you would like to join me.
Oh, I see. As a matter of fact, I (work) ....hard
But you(say).... you (write)....letters!