11 Compound - Coordinator only “We would walk out with a bottle of pop apiece and sometimes the pop would backﬁre up our noses and hurt.”
With no punctuation this is rare and risky. Theoretically none of the clauses are emphasized. In practice the ﬁnal is usually a little more punchy. When you want to fuse clauses into single undifferentiated statements this is good.
12 Compound - Punctuation only “In the morning it was sunny, the lake was blue.”
Compounds are almost always separated by some form of punctuation. A comma separates and emphasizes slightly ﬁnal clauses. Used when clauses are short and similar in form. A dash points up a hesitation or delay. A semicolon is standard coordinating mark, it emphasizes the entire sentence. Semicolons are a bit too heavy and formal to be used very often. A colon is even more formal, suggesting that what follows is a distinct addition to or explanation of what came before. When the relationship of clauses is so clear that no coordinator is necessary, use punctuation alone to link it. Emphasizes slightly separateness.