the students are discussing the questions in groups.为什么group 要加S呢

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• 这几句英语如何解释(1)He is the younger og the two brothers我想问的是这里younger前面为什么要加the 呢?(2)Beyond the stars , the astronaut saw nothing but space我想问的是stars前面为什么要加the,而space前面不加the.(3)We elected him headmaster of our school for a second time.我想问的是headmaster前面怎么不加定冠词,而second time后面要加定冠词a 呢?顺便问一下这句话是什么意思.(4)That man doesn't look like his age; I think he's somewhat in his sixties.除了用in his sixties 表示,还有其他表示在他60岁的短语吗?(5)Most students can go to college for further educ
• the students are discussing the questions in groups.为什么group 要加S呢
• do you have any questions和do you have any problem加s的问题口语中问道“你还有问题吗?”的时候,如果用到any,any后面的可数名词要加s吗?很常见的Do you have any questions为什么question后面要加s?那Do you have any problem后面要不要加s呢?
• ___time,they would certainly come and help to do the work.这里答案用had they这是一句虚拟的倒装句,但would certainly come and help 是一般现在时,那么从句要用过去时,为什么从句用过去完成时?
• there are two students in the room,___are discussing something heatedlyA the two of themB two of themC each of themD either of them不好意思，忘写选项了