1.We began to learn English three years ago.2.I have been to U.S.A. before.
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
答
1 We have learned English since three years ago .
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We have learned English for three years.
2 I haven't been to U.S.A before.
3 Why hasn't he come to school
4 How long has he learned English .
加油!不明白再问!