Educational worksheet for improving grammar and punctuation skills.

Problem Overview:

The task involves checking the accuracy of sentences for capitalization, punctuation, and spelling. The student is asked to mark the correct sentences and then rewrite them with proper capitalization, punctuation, and spelling.

Step-by-Step Solution:

#### Part 1: Mark the Correct Sentences
We need to evaluate each sentence for correctness in terms of capitalization, punctuation, and spelling.

1. Tom can run very fast.
- Correct: Proper capitalization (capital "T" for Tom), period at the end, and correct spelling.
- Mark as correct.

2. Dad has his own train.
- Correct: Proper capitalization (capital "D" for Dad), period at the end, and correct spelling.
- Mark as correct.

3. I seven years old.
- Incorrect: Missing a verb ("am") after "I." It should be "I am seven years old."
- Do not mark as correct.

4. My name is Mo.
- Correct: Proper capitalization (capital "M" for My), period at the end, and correct spelling.
- Mark as correct.

5. I like this cartoon.
- Correct: Proper capitalization (capital "I"), period at the end, and correct spelling.
- Mark as correct.

6. Mum likes her card.
- Correct: Proper capitalization (capital "M" for Mum), period at the end, and correct spelling.
- Mark as correct.

7. We was play tag.
- Incorrect: Incorrect verb tense. It should be "We were playing tag."
- Do not mark as correct.

8. Did you have the phone?
- Correct: Proper capitalization (capital "D" for Did), question mark at the end, and correct spelling.
- Mark as correct.

#### Marked Correct Sentences:
- Tom can run very fast.
- Dad has his own train.
- My name is Mo.
- I like this cartoon.
- Mum likes her card.
- Did you have the phone?

---

#### Part 2: Rewrite the Sentences with Corrections
Now, we will rewrite all the sentences with proper capitalization, punctuation, and spelling.

1. Tom can run very fast.
- Already correct.

2. Dad has his own train.
- Already correct.

3. I seven years old.
- Corrected: I am seven years old.

4. My name is Mo.
- Already correct.

5. I like this cartoon.
- Already correct.

6. Mum likes her card.
- Already correct.

7. We was play tag.
- Corrected: We were playing tag.

8. Did you have the phone?
- Already correct.

---

Final Answer:

#### Marked Correct Sentences:
1. Tom can run very fast.
2. Dad has his own train.
3. My name is Mo.
4. I like this cartoon.
5. Mum likes her card.
6. Did you have the phone?

#### Rewritten Sentences:
1. Tom can run very fast.
2. Dad has his own train.
3. I am seven years old.
4. My name is Mo.
5. I like this cartoon.
6. Mum likes her card.
7. We were playing tag.
8. Did you have the phone?

Final Boxed Answer:
```boxed{
1. Tom can run very fast.
2. Dad has his own train.
3. I am seven years old.
4. My name is Mo.
5. I like this cartoon.
6. Mum likes her card.
7. We were playing tag.
8. Did you have the phone?
}
```