1. She has taken good care of Chuchu till now.

2. She took Chuchu home and has cared for him till now.
3. She decided to take the pet home when he was a blind dog, and has cared for him very well.
4. She wanted to take the pet though he was blind, and has looked after him until now.
5. She was warm-hearted, so she took the pet home and has taken good care of him for more than 4 months.
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I have written down some sentences. Are they all grammatical? Would you let me know which sentences are commonly used?

1. She has taken good care of Chuchu for quite a while now.

2. She took Chuchu home and has cared for him well.
3. She decided to take the pet home because he was blind, and has cared for him very well.
4. She wanted to take the pet though he was blind, and has looked after him for quite a while.
5. She was warm-hearted, so she took the pet home and has taken good care of him for more than 4 months.

=)

All of the sentences are grammatically correct. However, the level of common usage may vary. Let's analyze each sentence:

1. She has taken good care of Chuchu till now.
This sentence is grammatically correct and commonly used. It implies that she has been taking care of Chuchu up until the present moment.

2. She took Chuchu home and has cared for him till now.
This sentence is grammatically correct and commonly used. It suggests that she brought Chuchu home at a specific point in the past and has continued to care for him since then.

3. She decided to take the pet home when he was a blind dog, and has cared for him very well.
This sentence is grammatically correct and commonly used. It explains that she made the decision to bring the pet (Chuchu) home when he was blind, and has been providing him with good care.

4. She wanted to take the pet though he was blind, and has looked after him until now.
This sentence is grammatically correct but might not be as commonly used. It conveys that she had the desire to take the pet home despite his blindness and has been looking after him until the present.

5. She was warm-hearted, so she took the pet home and has taken good care of him for more than 4 months.
This sentence is grammatically correct and commonly used. It highlights her warmth and kindness, indicating that she brought the pet home and has been taking good care of him for over four months.

In summary, all of the sentences are grammatically correct, but sentence 4 might be less commonly used compared to the others.