3. Neither he comes nor does he play.

This sentence showcases an interesting twist in English grammar! The structure used here is not standard in English. Instead, you could say, "Neither does he come nor does he play," to maintain parallelism and clarity. This structure keeps the negative sense intact while sounding more natural. Remember, parallel construction is your friend in English! Common mistakes when using "neither" often arise in verb agreement and the structure of negation. When using "neither," keep in mind that it often should trigger a singular verb form, which can mislead speakers into mixing up their subjects. Just maintain the singular form and you’ll avoid confusion—"Neither he nor she is going." It's a small tweak that makes a big difference!