that和this的用法及区别that和this在句子里怎么用?用于哪里?他们的区别是什么?Is this your book？Is that your ruler？两个差不多的句子，为什么一个用this一个用that？

this 和that用法的区别 that和this的用法及区别that和this在句子里怎么用?用于哪里?他们的区别是什么?Is this your book？Is that your ruler？两个差不多的句子，为什么一个用this一个用that？ THIS、THAT和IT的指代用法有什么区别? THIS,THAT和IT的指代用法有什么区别 问this that these those there 的用法和区别~ that is why和 this is why用法的区别 this和that的区别 that 和this的区别? 定语从句的用法及定语从句中that和which用法的区别 ,one和that的用法跟区别 that和which的用法区别 which 和that的用法区别 so that和such that的区别,用法 so…that和such…that的用法区别? so...that和so that的用法区别 so that too to such that 的用法和区别 these,this,that,those,it,they等的用法和区别 区别one,it,that,this作代词的时候意义和用法有什么不同?