Correct the mistakes in 27–30. there is one mistake in each. (27) i’ve ever been on tv. (28) you have written a letter to a newspaper? (29) i’ve never spoke in public. (30) have you ever call a radio programme?

27. I've never been on TV. .
28. Have you written a letter to a newspaper?
29. I've never spoken in public.
30. Have you ever called a radio programme?