问题描述：
1.We began to learn English three years ago.2.I have been to U.S.A. before.
3.He hasn't come to school because he was ill. 4.He has learned English for 5 years. 1.写出同义句.2.改为否定句.3.就划线部分提问.4.就划线部分提问
3.He hasn't come to school because he was ill. 4.He has learned English for 5 years. 1.写出同义句.2.改为否定句.3.就划线部分提问.4.就划线部分提问
问题解答：
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