问题标题：
【SAT句子提升的一道题求教Bypaintingthemthisafternoon,thewallwouldbecompletelydrybytomorrowevening.改bypaintingthem这一句.我选的是Afterpaintingthem,答案是Weretheytobepainted.为什么这么选?我选的为什】
问题描述：
SAT句子提升的一道题求教
Bypaintingthemthisafternoon,thewallwouldbecompletelydrybytomorrowevening.
改bypaintingthem这一句.我选的是Afterpaintingthem,答案是Weretheytobepainted.
为什么这么选?我选的为什么不对?也请帮我分析一下正确答案的结构.
刘玉平回答：
答案是if虚拟条件句的省略,相当于Iftheyweretobepainted,thewallwouldbecompletelydrybytomorrowevening.表示跟将来事实相反.if虚拟条件从句中如出现were,had,或者should,可提前至主语之前,省略if.
你选的afterpaintingthem,是省略了主语和be动词,这种省略的前提是从句和主句的主语是一致的,所以其完整形式应为：Afterthewallwaspaintingthem,这样可以看出句意不顺.
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