When two complete sentences are joined together using and or but you should put a comma before and or but.
I am trying to clean my car, but I don’t have any soap.
When two complete sentences are joined together using a conjunction (for, and, nor, but, or, yet, so), it should have a comma before it.
• I have spoken to Sarah, and she has confirmed the dates.
• I have spoken to Sarah. + She has confirmed the dates.
(Two simple sentences joined together with and)
Compare . . .
• I wanted to go to the beach but couldn’t afford to pay for a hotel room.
There shouldn’t be a comma before but because couldn’t afford to pay for the hotel room is not a complete sentence.
In the following sentence there should be a comma before but because I couldn’t afford to pay for a hotel room is a complete sentence.
• I wanted to go to the beach, but I couldn’t afford to pay for a hotel room.
Remember: A comma when you join two sentences.
The bear wants to play with his friends, but they can’t see him.
Use commas to add extra information
If you want to add extra information that is not important to a sentence, the information should have a comma before and after it. (3:15)
Vocabulary Video Lesson: Sleep
This vocabulary lesson will help you define sleep, nap, lie-in, snooze, dream, nightmare, drop off, nod off, drowsy and forty winks. (8:00)