Can your brother speak Chinese?, Yes, he can. He learned Chinese when he was 5 years old., He could speak Chinese when he was 5 years old., Can your sister drive a car?, Yes, she is a very good driver., When did she first learn to drive?, She could drive when she was 15 and got her permit., Can you use a computer?, Yes, it's not hard for me., When did you first learn to use a computer?, I could use a computer before I came to the U.S.,

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