This advanced grammar worksheet challenges students to identify the correct verb forms in space-themed sentences.

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Let me help you solve this worksheet by analyzing each sentence and explaining the rules of subject-verb agreement in context. Here's how we'll approach it:

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🔹 Subject-Verb Agreement Rules Reminder:

1. Singular subjects take singular verbs.
2. Plural subjects take plural verbs.
3. When a compound subject is joined by "or," "nor," "either...or," "neither...nor", the verb agrees with the subject closest to it (proximity rule).
4. Collective nouns (e.g., group, team) can be singular or plural depending on context.
5. Phrases like "one of the..." require a plural verb for the noun after "of" but a singular verb for "one."

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Now let’s go through each sentence one by one.

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1. Either Mars or Saturn ________ a very thin atmosphere.

- Subjects: Mars (singular), Saturn (singular)
- Connected by "either...or" → verb agrees with the closest subject (Saturn).
- Since Saturn is singular → has
✔ Answer: has

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2. Fifty percent of the class ________ looked through binoculars.

- "Fifty percent" is plural (refers to many students).
- The phrase "of the class" doesn’t change the number.
- So, plural subject → have
✔ Answer: have

> ⚠️ Note: Even though “percent” is singular, when followed by “of” + plural noun, the verb matches the noun (the class = plural).

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3. One of the largest moon craters ________ a huge area.

- "One of..." → singular subject ("one")
- "Craters" is plural, but it's part of the prepositional phrase.
- So, "one" is the subject → covers
✔ Answer: covers

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4. All the telescopes ________ computers and telescopes.

- "All the telescopes" → plural subject
- So, have
✔ Answer: have

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5. Groups of craters ________ the moon's surface.

- "Groups" is plural
- So, cover
✔ Answer: cover

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6. None of the students ________ missing.

- "None" can be singular or plural, but here it refers to students (plural).
- "Of the students" → plural
- So, are (plural verb)
✔ Answer: are

> ✔ Tip: When "none" means "not one" → singular; when it means "not any" → plural. Here, "none of the students" implies "not any", so plural.

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7. One of the comets ________ across the sky.

- "One" is singular → shoots
- But wait — "shoot" is irregular. The singular form is shoots.
✔ Answer: shoots

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8. One of the conference speakers ________ an astronaut.

- "One of..." → singular subject
- So, is
✔ Answer: is

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✔ Final Answers:

1. has
2. have
3. covers
4. have
5. cover
6. are
7. shoots
8. is

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📌 Summary of Key Concepts:

- "Either...or" / "Neither...nor": Verb agrees with the closer subject.
- "One of the...": Always use singular verb because "one" is the subject.
- "None of": Usually takes plural verb when referring to plural nouns.
- Collective nouns (like "class") → usually plural if acting individually.
- Percentages and fractions: Verb agrees with the noun that follows "of".

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