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Is this sentence correct?

I will buy ice cream when I think to.

thank you

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anonymous

Is this sentence correct?

I will buy ice cream when I think to.

No. It's sort of understandable as "when I think of it", but it's weird as written.

anonymous Finishing the sentence with « to »

I assume you're talking about a final 'to' of an infinitive, when you leave out the verb after 'to'.

Those are rare. Just about the only cases of that are the following:

want to, have to, need to, used to, plan to, would like to, wish to,
want (someone) to, need (someone) to, would like (someone) to, ask (someone) to, intend (someone) to

CJ