As a copy editor, one of your key responsibilities is to ensure that the subject and verb in a sentence agree in terms of number. This means that if the subject is singular, the verb must also be singular, and if the subject is plural, the verb must be plural as well. However, subject-verb agreement can be a tricky concept, especially when dealing with complex sentences or uncommon noun phrases.

In order to become proficient in subject-verb agreement, it is important to practice and hone your skills. Here are some tips on how to do just that:

1. Brush up on the rules: Before you start practicing, make sure you have a solid understanding of the rules of subject-verb agreement. This means reviewing the basic concepts, such as singular and plural nouns, collective nouns, and compound subjects. It can also be helpful to familiarize yourself with some common grammar mistakes related to subject-verb agreement, such as using a singular verb with a collective noun or ignoring prepositional phrases that come between the subject and verb.

2. Read widely: The more you read, the more exposure you will have to different types of sentences and noun phrases, which can help you become more adept at recognizing subject-verb agreement errors. Be sure to read a variety of materials, including news articles, academic papers, and fiction, as each type of writing can present its own challenges in terms of subject-verb agreement.

3. Practice with exercises: There are many online resources that offer exercises and quizzes specifically designed to test your understanding of subject-verb agreement. These can be a great way to reinforce the rules and identify areas where you may need more practice. Some popular websites that offer subject-verb agreement exercises include Grammarly, Khan Academy, and Purdue Online Writing Lab (OWL).

4. Use editing tools: There are also many editing tools available that can help you check for subject-verb agreement errors. For example, Grammarly offers a free browser extension that can scan your writing for grammatical errors, including subject-verb agreement mistakes. This type of tool can be especially helpful in identifying errors that you may have missed during your initial editing process.

5. Seek feedback: Finally, it can be helpful to seek feedback from others on your writing in order to identify areas where you may need more practice with subject-verb agreement. This could be as simple as asking a colleague or friend to review your work and point out any errors they notice. You could also consider working with a writing coach or tutor who can provide more personalized feedback and guidance.

Improving your skills with regards to subject-verb agreement takes time and practice, but by following these tips, you can become more confident in your abilities and ensure that your writing is clear, concise, and grammatically correct.