Understanding Sentence Correction and Grammar

The question asks us to find the most appropriate option to replace the underlined part "out deliver gifts" in the sentence: "Santa Claus stays at the North Pole when he isn’t out deliver gifts for Christmas." This requires an understanding of correct English grammar, specifically regarding verb forms used after certain words or phrases.

Analyzing the Original Sentence Structure

The sentence contains the phrase "out deliver gifts". In standard English, when "out" is used in this way to indicate being away from a place for a particular purpose or activity, it is typically followed by the gerund form of the verb (the -ing form). The phrase structure is commonly "out + verb-ing".

Examining the Substitution Options

Let's look at the options provided:

1. "out to delivering": This option uses "to delivering". While "to" can sometimes be followed by a gerund (e.g., "look forward to receiving"), this structure "out to delivering" is not a standard or grammatically correct phrase in this context.
2. "out delivering": This option uses the gerund form "delivering" after "out". This aligns with the common and grammatically correct structure "out + verb-ing" used to describe the activity being performed while out or away.
3. "No substitution": This would mean the original "out deliver gifts" is correct. As discussed, "out deliver" uses the base form of the verb after "out" in a way that is not grammatically standard for this usage.
4. "out of deliver": This option uses "of deliver". "Out of" is typically a prepositional phrase indicating origin, lack of something, or being finished with something (e.g., "out of stock," "climbed out of the car"). It is not used with a base verb like "deliver" in this context, nor does it fit the intended meaning of performing an activity while away.

Understanding the Correct Usage: "Out + Gerund"

The phrase "out delivering" correctly uses the gerund form of the verb after "out" to describe the activity Santa Claus performs when he is away from the North Pole. Examples of similar correct phrases include:

• "She's out shopping."
• "They are out hiking."
• "He spent the day out fishing."

In all these cases, "out" is followed by the -ing form (gerund) of the verb describing the activity.

Conclusion

Based on the analysis of the options and the correct grammatical structure "out + verb-ing," the most appropriate substitution for "out deliver gifts" is "out delivering gifts." This makes the sentence grammatically sound and conveys the intended meaning clearly.

Revision Table: Sentence Structure Analysis

Additional Information: Verbs and Gerunds After Prepositions/Phrases

Understanding when to use gerunds (-ing form) is crucial in English grammar. Gerunds can function as nouns and are often used after prepositions or certain specific phrases.

• After Prepositions: Verbs following prepositions are almost always in the gerund form (e.g., "interested in learning," "thank you for helping," "tired of waiting").
• After Specific Phrases/Verbs: Some verbs and phrases are typically followed by a gerund (e.g., "enjoy reading," "finish working," "keep trying," "spend time doing," "look forward to seeing"). The phrase "out" used to mean "away from home/work/etc., doing an activity" falls into a similar category where it's followed by a gerund.

Recognizing these patterns helps in selecting the correct verb form in sentences like the one about Santa Claus delivering gifts.