The answer is "could have forgotten" since you is the subject, you wouldn't include that in the verb phrase.
The key idea in President Obama's inaugural address was a call to restore responsibility.
<h3>What is an inaugural address?</h3>
It should be noted that an inaugural address simply means a first speech that's given by an individual starting a new job.
In this case, the key idea in President Obama's inaugural address was a call to restore responsibility. It was also about how ordinary people can take part in moving the country forward.
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