从句what 和whenleif followed biarni's directions and sailed to what is believed to be the coast of present-day canada.此句中的waht作主语,可是为什么不能用where呢?

从句what 和whenleif followed biarni's directions and sailed to what is believed to be the coast of present-day canada.此句中的waht作主语,可是为什么不能用where呢? what名词性从句和whatever名词性从句区别 引导从句时 what which 和 that 的区别定语从句和宾语从句都说说 用what,that分别造宾语从句,主语从句,和表语从句, which和what在定语从句和宾语从句的用法 定语从句和宾语从句的that和what有何区别? What和which有什么区别比如在名词性从句和定语从句中 在主语从句中that和what有什么不同 英语里的宾语从句that和what咋区分? 定语从句连接词what 和that的用法rt 宾语从句引导词what和that的区别 what和which在名词性从句中的区别, that和what 主语从句的区别如题 名词从句中如何区分关系词THAT 和what 名词性从句中的What和That的区别,详解. 宾语从句引导词what和that的区别 在引导从句中What和Whatever有什么区别 名词性从句中what和which的区别