Let's solve the problem step by step.
---
Lesson 2.12: Commas in Compound Sentences
We are asked to
combine two simple sentences into one
compound sentence using a
comma and the word "and" or "but".
The rule:
> A compound sentence is made of two smaller sentences joined by a
comma and the coordinating conjunction
and or
but.
Let’s go through each pair:
---
1. Abby rode her bike. Gilbert rode his scooter.
- These two actions happen independently and are related (both are riding).
- They are
not contrasting, so we use
and.
- Combine with a
comma and
and.
✔ Answer:
Abby rode her bike, and Gilbert rode his scooter.
---
2. My new bedroom is big. My old bedroom was cozy.
- These are two different bedrooms with different qualities.
- The second sentence doesn't contradict the first; it adds contrast in feeling.
- We can use
but to show contrast between the two rooms.
✔ Answer:
My new bedroom is big, but my old bedroom was cozy.
*(Note: "was" is past tense — this suggests a comparison between past and present. So "but" works well here to highlight contrast.)*
---
3. The black cat is beautiful. The orange cat is friendly.
- Two cats with different traits.
- No contradiction — both are positive.
- We can join them with
and because they are simply adding information.
✔ Answer:
The black cat is beautiful, and the orange cat is friendly.
---
4. Roberto is quick. Sophie is more graceful.
- These describe two people with different strengths.
- "Quick" vs. "more graceful" — not exactly opposite, but showing
difference in abilities.
- This is a
contrast in characteristics → use
but.
✔ Answer:
Roberto is quick, but Sophie is more graceful.
---
✔ Final Answers:
1.
Abby rode her bike, and Gilbert rode his scooter.
2.
My new bedroom is big, but my old bedroom was cozy.
3.
The black cat is beautiful, and the orange cat is friendly.
4.
Roberto is quick, but Sophie is more graceful.
---
📝 Explanation Summary:
- Use
and when joining similar or additive ideas.
- Use
but when showing contrast or difference.
- Always place a
comma before the conjunction (and/or but) in a compound sentence.
This helps make writing clearer and more connected!
Parent Tip: Review the logic above to help your child master the concept of commas in compound sentences worksheet.
