Question

everyone enjoys the fruits of their own good deeds (add question tags)​

Answer 1

Everyone enjoys the fruits of their own good deeds.

Add question tag.

Answer:

Everyone enjoys the fruits of their own good deeds, don't they?

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Explanation:

In this case,the statement is positive, so we will use a negative question tag.

Also, there is no auxiliary verb in the statement. So in such cases, we use don't, doesn't or didn't:

here, in given statement we will use: don't.

So,Correct answer is- Everyone enjoys the fruits of their own good deeds, don't they?

Also,If the statement is negative, we will have to use a positive question tag. 

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Answer 2

Answer: Everyone enjoys the fruits of their own good deeds........ Don't they ?