This worksheet helps students practice grammar by identifying missing capital letters and punctuation marks in ten simple sentences.

Let’s go through each sentence one by one. We need to:

1. Capitalize the first letter of sentences, names, days, months, cities, states, and proper nouns.
2. Add punctuation at the end — usually a period (.) for statements, or a question mark (?) for questions.

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Sentence 1:
*my dog coco has a cousin his name is prince*
→ Start with capital “M” → “My”
→ “coco” and “prince” are names → capitalize them → “Coco”, “Prince”
→ This is two ideas: “My dog Coco has a cousin.” + “His name is Prince.” → Add periods.
✔ *My dog Coco has a cousin. His name is Prince.*

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Sentence 2:
*prince and coco love to run jump and play*
→ Start with capital “P” → “Prince”
→ “coco” → “Coco”
→ List: “run, jump, and play” → add commas
→ End with period
✔ *Prince and Coco love to run, jump, and play.*

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Sentence 3:
*what is the most fun thing you can do with a puppy*
→ Question! So start with capital “W” → “What”
→ End with question mark
✔ *What is the most fun thing you can do with a puppy?*

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Sentence 4:
*my puppys bone is really big when compared to his body*
→ Start with capital “M” → “My”
→ “puppys” should be “puppy’s” (possessive) → but we’re only fixing capitalization & punctuation per instructions, so leave spelling unless it affects capitalization. Still, “puppy’s” needs apostrophe — but since instruction says only circle first letters and add punctuation, maybe skip? Wait — actually, “puppys” is wrong, but let’s stick to task: capitalize first word, add period.
→ Actually, “puppy’s” is possessive — but again, focus on capitalization and punctuation.
→ So: “My puppy’s bone...” — but if we must not change spelling, then just fix caps and punct. But “puppys” isn’t capitalized anyway. Let’s assume we fix obvious errors that affect meaning. Better to write “puppy’s”.
But per strict instruction: “circle the first letter... and add punctuation” — so maybe don’t fix spelling. Hmm. Let’s follow spirit: make it correct.
Actually, in school worksheets, they expect you to fix basic grammar too sometimes. But let’s stick to what’s asked: capitalization and punctuation.
So: “My puppys bone...” → still wrong, but perhaps worksheet expects us to notice “puppy’s”? I think we should fix it because otherwise it’s incorrect English.
Wait — looking back at original: “my puppys bone” — likely typo for “puppy’s”. Since this is educational, we’ll correct it.
→ Capitalize “My”, add apostrophe in “puppy’s”, add period.
✔ *My puppy’s bone is really big when compared to his body.*

*(Note: If strictly following only capitalization and punctuation without correcting spelling, it would be “My puppys bone is really big when compared to his body.” — but that’s grammatically incorrect. Given context, we’ll fix it.)*

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Sentence 5:
*today is thursday may 28 2020*
→ Capitalize “Today”
→ Days and months: “Thursday”, “May”
→ Date format: “May 28, 2020” → add comma after day
→ End with period
✔ *Today is Thursday, May 28, 2020.*

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Sentence 6:
*my sister amber loves to do math*
→ Capitalize “My”
→ “amber” is a name → “Amber”
→ End with period
✔ *My sister Amber loves to do math.*

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Sentence 7:
*my mom michelle works in leesburg florida*
→ Capitalize “My”
→ “michelle” → “Michelle”
→ City and state: “Leesburg, Florida” → capitalize both, add comma between city and state
→ End with period
✔ *My mom Michelle works in Leesburg, Florida.*

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Sentence 8:
*my dad steven works at disney*
→ Capitalize “My”
→ “steven” → “Steven”
→ “disney” is a company name → “Disney”
→ End with period
✔ *My dad Steven works at Disney.*

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Sentence 9:
*do you think that a temperature of 100 degrees is hot*
→ Question! Capitalize “Do”
→ End with question mark
✔ *Do you think that a temperature of 100 degrees is hot?*

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Sentence 10:
*grandpa lives in rochester new york*
→ Capitalize “Grandpa” (if used as a name/title here — yes, it’s like “Grandpa Smith”)
→ “rochester” → “Rochester”
→ “new york” → “New York” (state name)
→ Add comma? No, “Rochester, New York” — yes, city and state need comma
→ End with period
✔ *Grandpa lives in Rochester, New York.*

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Now, compiling all corrected sentences:

Final Answer:
1. My dog Coco has a cousin. His name is Prince.
2. Prince and Coco love to run, jump, and play.
3. What is the most fun thing you can do with a puppy?
4. My puppy’s bone is really big when compared to his body.
5. Today is Thursday, May 28, 2020.
6. My sister Amber loves to do math.
7. My mom Michelle works in Leesburg, Florida.
8. My dad Steven works at Disney.
9. Do you think that a temperature of 100 degrees is hot?
10. Grandpa lives in Rochester, New York.