A comma is usually unnecessary when the sentence starts with an independent clause followed by a dependent clause. Example: Let me know now if you are not sure about this. Rule 5. Use commas to set off nonessential words, clauses, and phrases (see Who, That, Which, Rule 2b).Click to see full answer. Thereof, what are the 8 rules for commas? Commas (Eight Basic Uses) USE A COMMA TO SEPARATE INDEPENDENT CLAUSES. USE A COMMA AFTER AN INTRODUCTORY CLAUSE OR PHRASE. USE A COMMA BETWEEN ALL ITEMS IN A SERIES. USE COMMAS TO SET OFF NONRESTRICTIVE CLAUSES. USE A COMMA TO SET OFF APPOSITIVES. USE A COMMA TO INDICATE DIRECT ADDRESS. Likewise, how do you use commas? Use a comma before any coordinating conjunction (and, but, for, or, nor, so, yet) that links two independent clauses. Use a comma after a dependent clause that starts a sentence. Use commas to offset appositives from the rest of the sentence. Use commas to separate items in a series. Besides, what is the Oxford comma rule? “The so-called ‘Oxford comma’ is an optional comma that follows the penultimate item in a list of three or more items and precedes the word ‘and’. The general rule is that it should be used consistently or not at all.Is it grammatically correct to put a comma before and?The word and is a conjunction, and when a conjunction joins two independent clauses, you should use a comma with it. The proper place for the comma is before the conjunction. Therefore, we need a comma before and. Don’t use a comma before and when one of the clauses it’s connecting is a dependent clause.