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KISS Grammar 
An Exercise on the Punctuation of Interjections
From: Growth in English: Seventh Year
Analysis Key

1. Oh [Inj], how cold (PA) it is! |

2. The guide, {of course}, [#1] is an excellent rider (PN). |

3. Why [Inj], what (DO) do you mean? |

4. Well [Inj], I hardly think [DO I can go]. |

5. {Of course}, [#1] it is too late (PN) {for the boys to go [#2] }. |

6. No [#3], it is not too late (PN) {for them}. |

7. Will you close the window (DO), please [#4]? |

8. Well [Inj], I suppose [DO you have ordered your tickets (DO)]. |

9. No [#3], I have not attended {to the matter}. |

10. Oh [Inj], how glad (PA) we are to see you [#5] again! |

1. Some grammars do, and some grammars to not indicate that prepositional phrases can function as interjections. KISS allows, and in the case of "of course," this explanation. (The grammars that do not consider it an interjection usually call it an adverbial phrase.)
2. The infinitive "to go" can be seen as an adverb to "late," or, with "boys" as its subject, as the object of the preposition.
3. Some grammars do not give explanations of "Yes" and "No." Some consider them adverbs, or they can be considered interjections.
4. Some grammars may consider "please" as a reduction of a subordinate clause -- "if it please you." There is probably no harm in explaining it as an interjection, especially since that explanation is much simpler.
5. "You" is the direct object of the infinitive "to see." The infinitive phrase functions as an adverb to "glad."