The weather in Beijing is better than in Shanghai.
The weather in Bejing is better than that in Shanghai.
The weather is better in Beijing than in Shanghai.
以上三句话我认为第一句是错的,后两句是对的。分析为:
The weather in Beijing is better than (the weather)in Shanghai.
省略了名词中心词,保留定语,错误。
The weather in Bejing is better than that in Shanghai(is).
省略系词。正确。
The weather is better in Beijing than in Shanghai.
同时省略的主语和谓语,保留状语,正确.