Take another look at the sentence:

After Mrs. Curall __________ irregular verb forms in her writing class, she discovered that the frequency of tooked and weared declined in her students' essays.

The sentence requires the simple past of teach, an irregular verb. Taught is the simple past form.

Verb Simple Present Simple Past Past Participle
teach teach(es) taught taught

Teached, the form you chose, is a spelling error. Before you continue, review the rules for irregular verbs.

Try again to escape Grammar Hell!

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