Final answer:
The correct verb form is 'writes' for the present tense ('He writes one every month.') and 'wrote' for the past tense ('He wrote one every month.'). Choosing the correct verb tense and ensuring subject-verb agreement are crucial for clear communication and avoiding grammatical errors.
Step-by-step explanation:
The correct verb form to use in the sentence 'He _____(write) one every month.' depends on the tense the speaker wants to convey. If the speaker is talking about a habitual action that occurs regularly in the present, the present simple tense should be used, making the sentence 'He writes one every month.' If the speaker refers to past habitual action, the sentence should be in the past simple tense: 'He wrote one every month.'
Choosing the correct verb tense is important for clear communication and is an important part of having a strong standard of writing quality. It's also crucial to ensure that the verb agrees with the subject to avoid grammatical errors. In the context of the exercise, where events may occur at different times, a combination of tenses could be used to accurately depict actions occurring in the past and the present.