为什么in their opinion中的opinion不加s?

为什么in their opinion中的opinion不加s? in their opinion还是 in their opinions? in their opinion 中的 opinion有复数么? in their opinion opinion后是否加s in their opinions还是in their opinion如题 是in their opinion还是in their opnions如题 in my opinion 中opinion要加s吗 In my opinion,the students had better finish their college In my opinion,students should not be judged by___ they have achieved in their study 英语In my opinion that students help each other with their lessonsIn my opinion ,that students help each other with their lessons_______ not only to their teachers but also to themselves.a.are helpful b.helps c.is a help d.is help为什么 in their house 中house为什么不加s in their earlier twenties 中为什么用earlier ?如何翻译? 哪位能肯定的回答in their opinion后加s吗? people is limited for expression their opinion in some country 有语法错误么?谢谢! In my opinion,their friendship has survived the passage time.如何翻译. in my opinion John,in my opinion,plays football,if not better,as good as Milk.为什么good要改 well,这个句子中 well和 good有什么区别 in the opinion of和in terms of区别I feel sure that _____ ability,you are abundantly suited to the job.为什么选in the opinion of