Quotation marks are often confusing to ESL writers unfamiliar with English grammar and punctuation rules. When to use double or single quotation marks is even trickier. However, there's no need to be embarrassed—these upside down commas sometimes confuse even the most seasoned English writers!
Quotation Marks Podcast: How to Format Quotation Marks
There is actually a lot to consider when using quotation marks, including when to use single or double quotation marks and how to format a quote within a quote. These questions, among others, are answered in this podcast.