Answer:

Explanation:
Given sentence,
Sabin slept at 9 pm.
To change this sentence into negative, add did not after the subject .
Sabin <u>did</u><u> </u><u>not</u> sleep at 9 pm.
Note: While changing positive sentences into negative, V² takes did ( V² = did + V¹ )
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They both separate sentences or parts of a sentence
1.Help the needy, 2. bring peace, 3. keep the world clean. 1. There are many people who don't have clothes, water, or food. 2. There should be so much chaos in the world. 3. The earth is important; it where we live and if we don't clean it up, we would have any where to live.