would be should be区别 1.he said that would be possible to build a platform in the centre of the channel. 2.the tunnle would be well-ventilated if tall chimneys were built above sea level. 这两句为什么用的是would be而不是would? 3.he suggested that a double railway-tunnel should be built? 第3句中为什么不用would 而用should be?
1,2句中possible和well-ventilated 都是形容词,而would是情态助动词,后面必须跟个动词使用,而形容词前往往用be动词,所以是would be. 3,suggest后面跟虚拟语气,即不管后面从句主语是什么,从句中的动词都用动词原形或should加动词原形.而would的意思是"将".不符合题意. 另外,你这些句子都是新概念二里的吧.我教这个教材的.