1) We walk/are walking along the beach now. 2) He has driven/
has been driving around the town for half an hour. 3) I have
already written/have already been writing an essay. 4) Sam
often wakes up/has often waken up at half past six in the
morning. 5) They are flying/have been flying over the Pacific
Ocean at the moment. 6) My parents don't pay/haven't paid
for the tickets yet. 7) Andy hasn't phoned/hasn't been phoning
her yet. 8) What is happening/has happened now? 9) Emma has
written/has been writing the letters since ten o'clock. 10) Tony
has made/has been making seven calls since morning.
