Final answer:
The correct verb form to use when the subject is the plural noun 'parents' is 'go,' making the sentence read: 'My parents go to the market on Saturday.'
Step-by-step explanation:
The question you're asking relates to the subject-verb agreement in English, which is an essential part of constructing correct sentences. It's important to match the verb with the subject in terms of number (singular or plural). The subject in your sentence is 'parents,' which is a plural noun.
Therefore, the correct verb form to use is 'go.' Plural subjects take a plural verb, and in this case, go is the plural form, whereas goes is the singular form that matches with a singular subject like 'he' or 'she.' When looking at similar sentences like 'The family packed their suitcases for their vacation,' we clearly see the importance of using the correct verb form to align with the subject's number.
With all these considerations, the correct answer to your question is: 'My parents go to the market on Saturday.'