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 what your grandmother does regularly whenever she visits, so it needs the simple present tense. With the singular subject “she,” the verb takes an -s: “she always brings me a gift.” “Brought” is past tense, and “bringing” does not fit here.

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