The correct spelling is conference!
I really hoped this helped! <u>
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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.
Sandford, legal case<span> in which the U.S. Supreme </span>Court<span> on March 6, 1857,</span>ruled<span> (7–2) that a slave (</span>Dred Scott<span>) who had resided in a free state and territory (where slavery was prohibited) was not thereby entitled to his freedom; that African Americans were not and could never be citizens of the United States</span>
