1、We ____on the moon as we do on the earth if_____air and water on it?为什么填could live和there were ,can live 和there was 为什么不对?2、When I was young I_____a lot of football.为什么填did play不是was playing?3、If I ______in yo

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1、We ____on the moon as we do on the earth if_____air and water on it?为什么填could live和there were ,can live 和there was 为什么不对?2、When I was young I_____a lot of football.为什么填did play不是was playing?3、If I ______in yo
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1、We ____on the moon as we do on the earth if_____air and water on it?为什么填could live和there were ,can live 和there was 为什么不对?2、When I was young I_____a lot of football.为什么填did play不是was playing?3、If I ______in yo
1、We ____on the moon as we do on the earth if_____air and water on it?
为什么填could live和there were ,can live 和there was 为什么不对?
2、When I was young I_____a lot of football.
为什么填did play不是was playing?
3、If I ______in your position ,I _____give up trying a second time .
为什么是were和would’t不是was和won’t?

1、We ____on the moon as we do on the earth if_____air and water on it?为什么填could live和there were ,can live 和there was 为什么不对?2、When I was young I_____a lot of football.为什么填did play不是was playing?3、If I ______in yo
1.could较为委婉,可能性较小 在表达虚拟语气的时候,无论单复数均用were
2.did表示强调 was表示进行时态
3.虚拟语气,一切人称均用were,同时使用wouldn't,不用won't

1.表示可能性小,语气不如后者强烈
2. did play 确实踢过 did 放在实意动词前起强调作用,was 不可以
3. 虚拟语气,固定用法