Dave's ESL Cafe's Student Discussion Forums

[Herman Apeja]

What I want to tell you here is just about the usage of comma before 'and, but and or' or.
We can use comma before and, but and or if there are two subjects in the sentence. For example; It's a really good camera, but I can't afford it. in this example we see that there are two subjects; they are It and I.
But don't use comma if there is only one subject. for instance, Daniel sat down and took his shoes off.