作业帮she was ill so she wouldn't be able to go skating the next day.不什么时候不用is .wouldn't be
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she was ill so she wouldn't be able to go skating the next day.不什么时候不用is .wouldn't be
she was ill so she wouldn't be able to go skating the next day.
不什么时候不用is .wouldn't be
she was ill so she wouldn't be able to go skating the next day.不什么时候不用is .wouldn't be
句子中的go skating 是过去（没有）发生的动作
the next day意思是tomorrow,因为用了the next day 代替了tomorrow,所以其实是“明天”也是过去,用WAS.
“过去”的过去（比如昨天上午）,她病了；所以过去（比如昨天下午,也就是“过去”.“过去”参照点）,它不能去了.
有点乱……
因为go skating 是将来可能要做的事情。
再说‘她病了’，用的是过去时，后面再用is 于句意衔接不上。
楼主你是想问 为什么不用is ... wouldn't be 吧？ 研究了我半天。
因为句子要讲究时态一致性。
这个句子属于“原因状语从句”本身讲的就是一个过去的事情，主句 She was ill 说的是“她（之前的某一天）病了”，是过去时。所以从句“so she wouldn't be able to go skating the next day.”必须也要用过去时，因为这是过...
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楼主你是想问 为什么不用is ... wouldn't be 吧？ 研究了我半天。
因为句子要讲究时态一致性。
这个句子属于“原因状语从句”本身讲的就是一个过去的事情，主句 She was ill 说的是“她（之前的某一天）病了”，是过去时。所以从句“so she wouldn't be able to go skating the next day.”必须也要用过去时，因为这是过去的状态。
如果要用is，句子就必须改为：she is ill so she will not be able to go skating next day.
两个需要注意：is和will相一致，都是一般现在时。the next day的“the”要去掉，因为在过去的时间里说“第二天”通常说the next day，现在时则不用。
明白了吧。
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