Focus on the MEANING.
John is THE ONLY ONE of the members WHO IS PLANNING TO ATTEND.
Here, John is THE ONLY ONE planning to attend.
No other members are planning to attend.
In other words:
Of the members, John is THE ONLY ONE WHO IS PLANNING TO ATTEND.
Since John is THE ONLY ONE, IS PLANNING is correct.
John is only one of THE MEMBERS WHO ARE PLANNING TO ATTEND.
Here, other members ARE PLANNING to attend.
John is ONLY ONE of these members.
In other words:
Of the MEMBERS WHO ARE PLANNING TO ATTEND, John is only one.
Since John is not THE only one -- other members ARE PLANNING to attend -- a plural verb is needed here.
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As a tutor, I don't simply teach you how I would approach problems.
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