I’m not sure ______ she will come to the party.

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Multiple Choice

I’m not sure ______ she will come to the party.

Explanation:
When you’re expressing doubt about a future event, you often introduce a yes/no question with a clause. Here, the event is whether she will come to the party. Using the connector that signals two possibilities keeps the meaning clear: I’m not sure whether she will come. The other options don’t fit as well. “When” asks about timing, not attendance. “Where” asks about place. And while you sometimes hear “I’m not sure if she will come,” the more formal and precise choice here is “whether,” which sets up the two possible outcomes (come or not come) without focusing on location or time.

When you’re expressing doubt about a future event, you often introduce a yes/no question with a clause. Here, the event is whether she will come to the party. Using the connector that signals two possibilities keeps the meaning clear: I’m not sure whether she will come.

The other options don’t fit as well. “When” asks about timing, not attendance. “Where” asks about place. And while you sometimes hear “I’m not sure if she will come,” the more formal and precise choice here is “whether,” which sets up the two possible outcomes (come or not come) without focusing on location or time.

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