Review the item:
On Sunday Michael spent the
afternoon waxing his new car. If he had knew
about the two pop quizzes on Monday, he
would have given his algebra
problems and accounting spreadsheets more attention.
The second verb, had knew, is incorrect. This verb requires the past participle known because of the auxiliary verb had.
Know is an irregular verb; the chart below shows its forms.
| Verb | Simple Present |
Simple Past |
Past Participle |
|---|---|---|---|
| know | know(s) | knew | known |
Spent, the verb you chose, is perfectly correct. Before you continue, review the rules for irregular verbs.