Slight pauses in a sentence are taken care of by the good sense of the reader. Do not sprinkle commas when the sentence is moving along freely with no complication in the thought.

[2.] To separate an adjective from its noun:

[3.] Before the first word or phrase in a series unless the comma would be employed if the word or phrase stood alone:

Exercise:

  1. Before the workmen finished eating the tunnel caved in. Three Italian laborers were crushed, the others with the foreman escaped.
  2. Sneed the new chairman proposed that the convention should meet at Cheyenne Wyoming. The suggestion however was according to reports not adopted.
  3. He had a pen and an ink bottle was in the cupboard. By washing poor widows can earn but scant living.
  4. Saunders asked, how I liked the Overland car as compared with the Chalmers, the Hudson and the Buick. I started to reply but at that moment we were interrupted.
  5. People, who steal watermelons, say the stolen melons are sweetest. Farragut who was born in Tennessee was the North's ablest naval commander. The developer is a chemical, which reduces the silver salt.
[The Semicolon]