The semicolon connects two closely-related sentences. It provides a pause more emphatic than a comma, but less than a period.

 Use a semicolon:

  • To connect two independent clauses not joined by a coordinating conjunction (for, and, nor, but, or, yet, so).
    • Both clauses must be complete sentences.
    • Example: Jim walked into the kitchen; the teapot was singing.
  • To connect two independent clauses linked with a transitional expression.
    • Transitional expressions are words such as accordingly, consequently, instead, nevertheless, however, or similarly, or phrases such as in addition, as a result, in fact, or on the other hand. These are not the same as the coordinating conjunctions mentioned before.
    • Example: Jim saw a llama in the kitchen; therefore, he went back into the living room.
    • Note that the transitional expression "therefore" is followed by a comma.
  • To separate elements in series containing internal punctuation.
  • Normally commas separate elements in a series or list, but it can be confusing if the listed items also contain punctuation; a semicolon alleviates this problem.
  • Example: Jim had planned to make chocolate, vanilla and carrot cakes; apple, blueberry, and pumpkin pies; and cinnamon, raisin, and oatmeal cookies.
    • If commas were substituted for semicolons the reader would have a difficult time determining which words were meant as adjectives (chocolate, apple, raisin) and which were meant as nouns (cakes, pies, cookies). The use of semicolons avoids this.

Do not use a semicolon:

  • To join a sentence fragment to a sentence.
    • The clauses on each side of a semicolon must be complete sentences.
  • Between a subordinate clause and the rest of the sentence.
    • A subordinate clause is a complete sentence that contains a subordinating word such as because, rather than, unless, or while. A subordinate clause can be preceded by a comma, but not a semicolon.
  • To introduce a list.
    • Use a colon for this.
  • Between independent clauses joined by a coordinating conjunction.
    • This just isn't allowed.