12 Common Writing Mistakes Bloggers Make Source: Grammar Check If you enjoyed this post, read: 7 Simple Ways To Generate New Ideas 30 Idioms You Need to Know & Their Meaning 33 Commonly Misunderstood Words & Phrases Learn how to blog and write for social media! Join us for The Complete Blogging and Social Media Course. Mail email@example.com now for more information. Posted on 21st November 2016 (4,801 views) Explore: Blogging, Grammar, Infographic, Social Media Monday This article has 2 comments Denise van Hulst 21st November 2016 I was taught in English class that there is no comma before and and but in a sentence. AggieCowboy 21st November 2016 #10 is wrong. Or, rather, outdated. The singular “they/their” is acceptable and understood to be singular by the context of the sentence. @Denise: No comma if the clause following the conjunction is incomplete, but a comma is required if it is a complete clause that can stand as it’s own sentence. Then there’s the Oxford comma when writing lists. It’s not always needed; however, not using a comma before the conjunction may completely change the sentence. Comments are now closed.