how和where引导的从句He didn't know how he was going to get the mon
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引导的是宾语从句,如果换成where,就会改变意思,语法是没有错的.He didn't know how he was going to get the money for his wife and himself to make the trip.意思是,他不知道怎么才能赚到钱来供他与他妻子去旅行.换成where 就是,他不知道去哪里赚钱来供他与他妻子去旅行.前者强调方式,后者强调地点.但是语法上,有点区别是,how是做get的方式状语,而where 是做go的地点状语,而不是get的.就是说两个词的转变导致了going在里面意义的转变.前者中的going是was going to将来时代的成分,单独讲没有意义,而后面的going就是动词,有实义.因为是将来时,所以要用be doing的形式.