The sentence, "Even though I finished my homework", is an example of a;
A sentence fragment is a group of words that does not express a complete thought. The sentence could be missing in a subject, verb, or object.
The sentence above is a sentence fragment because it does not express a complete thought. There is something missing.
We could complete the sentence thus;
"Even though I finished my homework, he still failed me."
We could also add meaning to it thus;
"I failed, even though I finished my homework".
By adding another dependent clause, the sentence attains complete meaning.
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