Sentence Fragment Sentence

I am.

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• Fragment :(

It is hot.

• Sentence :)
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Look at the second part in blue.  Then, choose the best answer:
Why should I listen to you.
Because I am your mother.

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I do.

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• Fragment :(

If it rains.

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While you are talking.

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Look at the second part (in blue).  Then, pick the correct answer.
We will chase him.  If he runs.

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It is.

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• Fragment :(

Because it is hot.

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Where does the comma go?
If it is hot we will go swimming and then will eat ice cream.

• hot, 
• swimming, 
• no comma needed