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KISS Grammar 
An Exercise on Commas
From: Growth in English: Seventh Year

Analysis Key

     Note that all grammarians will not necessarily agree with these answers, and professional writers often ignore the rules.

1. William, [DirA] your father is here. |

2. Yes, I know [DO he is]. |

3. He is bringing bacon (DO), bread (DO), butter (DO), and milk (DO). |

4. My address is 40 Pine Street, Creston, Iowa (PN). |

5. Well, [Inj] it is time (PN) {for us to go [#1] }. |

6. We will meet you (DO) {at the station}, {of course} [#2]. |

7. The author died April 20, 1865 [NuA]. |

8. Good-by, [Inj] we will see you (DO) {on Wednesday}, July 15 [#3]. |

9. Red, white, and blue are our national colors (PN). |

10. Well, [Inj] boys, [DirA] where are you going? |

11. Oh, [Inj] what [#4] lucky boys (PN) you are! |

12. It is your turn (PN), Helen [DirA]. |

13. No, I have had a turn (DO). |

14. Helen, Jane, and May are visiting {in Chicago}. |

15. {Of course}, [#5]  I can go, George [DirA]. |


Notes
1. With "us" as its subject, the infinitive "to go" can be considered as the object of the preposition. Alternatively, the infinitive can itself be seen as functioning as an adjective to "time."
2. The exercise suggests that the authors of Growth in English considered "of course" to be functioning as an interjection.
3. "July 15" is an appositive to "Wednesday."
4. "What" here is a pronoun that functions as a noun used as an adverb. Note that it means "How lucky you boys are."
5. See Note # 2. The authors clearly wanted a comma here, but my sense is that many writers would not use one.