题目内容
【题目】I'm going by train． (改为否定句)
【答案】I'm not going by train.
【解析】句意：我坐火车去。含有be动词的句子变否定句直接在be动词后加not，所以答案是I'm not going by train.
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题目内容
【题目】I'm going by train． (改为否定句)
【答案】I'm not going by train.
【解析】句意：我坐火车去。含有be动词的句子变否定句直接在be动词后加not，所以答案是I'm not going by train.