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1. In Japan today throw-away tissues are so universal 是主句。
2. that cloth handkerchiefs are regarded as old fashioned, 是从句。
3. 在主句中，In Japan today是时间地点状语。throw-away tissues是主语。are so universal 是系动词和表语。
4. 在从句中，cloth handkerchiefs是主语。are regarded as old fashioned是谓语部分。not to say unsanitary是状语。

n Japan today throw-away tissues are so universal that cloth handkerchiefs are regarded as old fashioned, not to say unsanitary.

主语：tissues
系动词：are
表语：universal
主句为上面的主系表结构
在（so)..that引导的从句中：handkerchiefs 主语
regarded 谓语（被动）
fashioned 宾语

主干应该只看主句，所以该句子主干为主系表结构

In Japan today时间地点状语
throw-away tissues（主语）are so universal that cloth handkerchiefs are regarded as old fashioned,主句。结构是so...that...，regard as...
not to say unsanitary.是补语吧。更别提。。。的意思

In Japan today时间地点状语
throw-away tissues（主语）are so universal that cloth handkerchiefs are regarded as old fashioned,主句。结构是so...that...，regard as...
not to say unsanitary.是补语吧。更别提。。。的意思

that cloth handkerchiefs are regarded as old fashioned, not to say unsanitary 状语从句

throwaway tissues 是主语

In Japan today时间地点状语