根据句子要求变换句型。 1.If you need help let me know. ( 改为反义疑问句 ) 2.I saw it. Mary was reading the book at that moment. ( 改为简单句 ) 3.The bridge is (fifty metres) long. ( 就画线部分提问 ) 4.Could you tell me when we will go to Hong Kong? ( 改为简单句 ) 5.This coat is too big for you. This coat is too small for you. ( 合并为一个简单句 )