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Based on Introductory Lessons in English Grammar For Use in Intermediate Grades 
By Wm. H. Maxwell, M.A.

The Punctuation of Compound Main Clauses (L3.1.1 # 4)
Analysis Key

1. Charcoal and the diamond are very unlike (PA), | yet [#1] they are

composed (P) {of exactly the same substance}. |

2. The army {of the enemy} swept {over the face} {of that fair land}, | and {in its path}

followed famine and desolation. |

3. He was not driven (P) {from his purpose} {by danger}, [#2] | neither was he 

discouraged (P) {by repeated failures}. |

4. {During the hot days} {of summer}, cool breezes {from the sea} blow { over the 

heated land}, | but warn land-breezes blow seaward {at night}. |

5. The way was long (PA), | the wind was cold (PA), [#3] |

           The minstrel was infirm (PA) and old (PA). |

1. "Yet" here means "but."
2. Although the two main clauses are short, some people will consider this to be a comma-splice.
3. In this case, not only are the main clauses short, but this is also a poem. An "and" here would ruin the meter.