I will tell you a little of why pets are good for us, Because some pets can be Service pets... and they can help people that have Medical issues :)
simple
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simple
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compound
For 18-21, you just need to add for, and , but, nor, or, yet and add another sentence
The dialogue seems to reveal that Kugler regrets that he didn't find the money. Talking about all of Kugler's evil deeds, God mentions an old couple that Kugler had killed hoping to find a significant amount of money. However, all he could find was sixteen dollars. Now God reveals to him that they had actually kept 20 thousand dollars in a mattress. Kruger doesn't seem to regret murdering those people, but not finding the money he was after.
You would use an interrogative type.