1. Commas Practice

2. Add missing commas to the following paragraph.
There are two types of punctuation internal punctuation and external punctuation. Internal punctuation is used within a sentence and external punctuation is used at the end of a sentence. There are six main rules for the placement of commas the most important pieces of internal punctuation. Semicolons the next most important have two main functions. Their primary function separating two independent clauses is widely known. A lesser-known need for semicolons to separate items in a list already containing commas occurs rarely in college writing. Colons and dashes have special uses in sentences. And of the three pieces of end punctuation—periods question marks and exclamation points—one is obviously the most common. That piece is the period which signals the end of the majority of English sentences.

3. Answers
There are two types of punctuation, internal punctuation and external punctuation. Internal punctuation is used within a sentence, and external punctuation is used at the end of a sentence. There are six main rules for the placement of commas, the most important pieces of internal punctuation. Semicolons, the next most important, have two main functions. Their primary function, separating two independent clauses, is widely known. A lesser-known need for semicolons, to separate items in a list already containing commas, occurs rarely in college writing. Colons and dashes have special uses in sentences. And of the three pieces of end punctuation—periods, question marks, and exclamation points—one is obviously the most common. That piece is the period, which signals the end of the majority of English sentences.