Answer:
<u><em>Past Simple:</em></u>
Rockwell painted a picture.
<u><em>Past Continuous:</em></u>
Rockwell was painting a picture.
<u><em>Past Perfect:</em></u>
Rockwell had painted a picture.
<u><em>Past Perfect Continuous:</em></u>
Rockwell had been painting picture for 2 hours.
?
Explanation:
1.
Valediction is the act of saying farewell.