My grandmother is to visit tomorrow. If I had earlier, I would have a cake or bought her a gift. Whenever she visits, she always me a gift. I can’t wait to see her!

The sentence describes something that did not happen in the past: the speaker did not find out about the visit early enough to prepare. In a past hypothetical conditional, use “had” plus the past participle: “If I had known earlier, I would have baked a cake or bought her a gift.” “Known” is the past participle of “know,” so the correct choice is known.

AI-written and checked against the verified answer.