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A complete sentence must have a subject and verb (predicate).  If either one is missing, the sentence is incomplete. In fact, you cannot use one without the other and still have a complete sentence.  
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Examples of Complete Sentences

1. The dog ran around in circles.

2.  Living life is always a trip.

3.  Ms. Molly is nasty.

4.  In the morning, birds sing and dogs bark.

Examples of Incomplete Sentences

1. The dog around in circles

2. Living life always a trip

3. Ms. Molly nasty

4. In the morning sing and bark