1. I think Chuchu should live with his old master because he is a very good person. When Chuchu was almost blind, he didn't abandon Chuchu. Instead, he decided to take good care of him.

1-2. I think Chuchu should live with his old master because he is a very good person: When Chuchu was almost blind, he didn't abandon Chuchu. Instead, he decided to take good care of him.

2. I think Chuchu should live with his new master because she is warm-heated. When Chuchu was blind, she wanted to take him home with her, and has cared for him very well.

2-2. I think Chuchu should live with his new master because she is warm-heated: When Chuchu was blind, she wanted to take him home with her, and has cared for him very well.
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Would you check the sentences? How about 1-2 and 2-2? In the passages, a colon was used. Are they correct? Do we have to capitalize the word after colon?

3 answers

How about 1-2 and 2-2? 1 and 1-2 sentences are both fine. 2 and 2-2 will be correct once you spell "warm-hearted" correctly and remove the commas after "her" in both sentences.

In the passages, a colon was used. Are they correct? Do we have to capitalize the word after colon?
Yes, the colons are used correctly, and yes, because you have included complete sentences after the colons, the capitalization is correct.
Thank you for yoiur help.

1. I think Chuchu should live with his old master because he is a very good person. When Chuchu was almost blind, he didn't abandon Chuchu. Instead, he decided to take good care of him.

1-2. I think Chuchu should live with his old master because he is a very good person: When Chuchu was almost blind, he didn't abandon Chuchu. Instead, he decided to take good care of him.

2. I think Chuchu should live with his new master because she is warm-hearted. When Chuchu was blind, she wanted to take him home with her and has cared for him very well.

2-2. I think Chuchu should live with his new master because she is warm-hearted: When Chuchu was blind, she wanted to take him home with her and has cared for him very well.
All correct, yes.
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