Final answer:
The appropriate conjunction for the sentence 'He is both a singer and a drummer' is 'and'. This connects words or phrases of the same kind. Correct verb selection and sentence structure, as well as proper punctuation, are important for grammatical accuracy.
Step-by-step explanation:
The correct conjunction to fill in the blank in the sentence 'He is both a singer and a drummer' is and. This conjunction is used to connect words of the same part of speech, clauses, or sentences that are to be taken jointly. For the verb selection exercise, the appropriate verb choices would be based on subject-verb agreement and verb tense appropriateness, given the subject of the sentence. For example, 'Under the table, his slippers and socks are' and 'The choir usually meets in the auditorium' would complete the sentences correctly as they agree with the subjects in number and tense. Additionally, understanding the difference between compound subjects, verbs, or objects and their punctuation is crucial for creating grammatically correct sentences.
Incorrect sentence structuring can be revised for clarity and conciseness. For instance, 'The required qualification is the ability to write well' is a clearer revision of the original mixed sentence. It is also important to use commas properly with coordinating conjunctions for compound sentences and to recognize subordinating conjunctions for dependent clauses.