Sometimes, you might have to use parentheses within parentheses. According to the APA style, in this case, you will need to create these two levels of enclosure by using brackets inside of parentheses. With mathematical equations, however, it works the other way around: for two levels of enclosure, parentheses go inside brackets. For three levels, curly…

# 1. Use parentheses when you want to add extra information, but be very careful with the grammatical structure of the sentence. Remember that, if you remove the parentheses, your sentence should still both make complete sense and be grammatically correct. So, the sentence “My best friend (and his parents) traveled to Belgium last spring”…

What are Parentheses? Parentheses () are punctuation marks that always come in pairs: you are very unlikely to see a sentence with just one parenthesis in it. Parentheses are used to give details about the topic and to indicate a phrase that interrupts the natural flow of a sentence.