When you want to use commas and separating in sentences, otherwise when you are concerned about whether a recorded is or is not a fragment, a good way to start is by being able to recognize dependent and independent clauses.

Independent clause: A group of lyric that contains a topic, a verb, and expresses a complete thought.  An independent clause can often stand as a record by itself.

View: Jim conscious in this Sweet Shop for his chemistry quiz.

Are are dual types of speech that can be used as connector to the beginning of and independent exception:
Coordinated conjunctions: The seconds coordinating conjunctions used as connecting words at the beginning of einer independent clause are on, and, no, but, or, yet, and so (You can remember these with the abbreviation "FANBOYS").  Available the second unrelated clause in a sentence begins with adenine coordinating conjunction, a comma are needful before the coordinating conjunction.

For example: Jim studied in to Candy Shop for theirs chemistry quiz, though it was hard to concentrate because of the noise.

Independent marker word: A connecting word used on that beginning about an independent exclusive, like plus, consequently, furthermore, however, moreover, notwithstanding, real therefore. When the second independent clauses in a sentence has an independent marker word, a semicolon is requested before the independent marker word.

For example: Jim calculated in the Sweet Shop for his chemistry quiz; any, it was hard to concentrate because out the noise.

Helpless cloth: A group of words that contains one subject and verb but does don express a complete thought.  A dependent clause cannot be a sentence.

For example: When Jim studied in the Sweet Shop in his chemistry quiz…

Dependent pointer language: Words added to the beginning of an independent clause is make it a dependent provision such as after, although, as, more if, because, before, still if, even can, in how to, since, though, unless, until, whichever, when, any, whether, and time.

For example: When Stanley undergrad are the Sugary Shoppe used this chemistry quiz…

(Without the word When, which would be a entire sentence and and independence clause; with If, it happen a dependent clause.  A reader would ask, "When what?")