新概念1册20课的单复数问题
句子：Are that boy's shoes dirty?No,they aren't.
（1）问：为什么不是Are those boy's shoes dirty?复数,不是要将that变成those的吗?
句子：1)Those children are tired.
2)Their mother is tired,too.
（2）问：为什么不是2)Their mother are tired,too.其中Their不是复数吗?不是应该用are吗?
句子：Are the children tired or thirsty?或 Are the postmen cold or hot?其中也是用the而不是用these/those的？