Final answer:
The correct verb form that completes the sentence is 'debo' and it means 'must' or 'have to' in English.
Step-by-step explanation:
The correct verb form that completes the sentence is 'debo'.
The sentence 'Quiero ir de compras, pero yo debo estudiar' translates to 'I want to go shopping, but I have to study.'
In this sentence, 'debo' is the first person singular form of the verb 'deber', which means 'to have to' or 'must'.
Learn more about Spanish verbs