I don't know what to + (verb)

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You are letting someone know that you are not sure about what is being asked. You may also have no knowledge or opinion on a topic.

Here are some examples:

I don't know what to eat for dinner.

I don't know what to buy you for your birthday.

I don't know what to say.

I don't know what to do with my spare time.

I don't know what to do for vacation.

I do not know what to do to make you happy.

I do not know what to do to help you understand.

I do not know what to think.

I do not know what to do to prevent this.

I do not know what to order.