Final answer:
The word in the sentence that should begin with a capital letter is 'you'.
Step-by-step explanation:
The word in the sentence that should begin with a capital letter is you.
In English, we capitalize the pronoun 'you' when it is used as the subject of a sentence, as in this case.
For example, 'You can work as a guide' is a correct sentence with the pronoun 'you' capitalized.
Learn more about Capitalization in English sentences