Can you use more than once in an English sentence?

Yes, the word "more" can be used more than once in a sentence. Here are a few examples:

* "The more you learn, the more you realize how much you don't know." (This uses "more" twice in a comparative structure)

* "I'd like more cookies, and more milk, please." (This uses "more" twice to indicate a quantity)

* "The more time I spend with you, the more I appreciate your company." (This uses "more" twice in a comparative structure)

You can use "more" as many times as you need to express your meaning, as long as it's grammatically correct and makes sense in the context of your sentence.