mình thắc mắc chỗ này xíu ạ: combine who 1.The singer is My Tam. She is famous for her charity work. c1: My Tam is the singer who is famous for her charity work c2: The singer who is famous for her charity work is Mỹ Tâm. 2.Samuel Johnson was the son of a bookseller. Samuel Johnson was born in 1709. c1: Samuel Johnson was the son of a bookseller who was born in 1709 c2: Samuel Johnson , who was born in 1709, was the son of a bookseller. 3. The singer is Mary. She has a beautiful voice c1: Mary is the singer who has a beautiful voice c2: Mary, who has a beutiful voice, is the singer ( cái này mình ko biết có cần thêm dấu phẩy hay ko) c3: the singer who has a beutiful voice is Mary cho mình hỏi cách nào đúng cho từng câu ạ ? Và giải thích vì sao lại đúng ạ ? Nếu có thể, cho mình thêm ví dụ được ko ?

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