"in my opinion"中的opinion可以加s吗

"in my opinion"中的opinion可以加s吗 in my opinion 中opinion要加s吗 为什么in their opinion中的opinion不加s? in our opinion的opinion可以加s吗大神们帮帮忙 in one's opinion中的opinion加不加s in their opinion opinion后是否加s In my opinion in my opinion等于什么? 关于in one’s opinion in one's opinion=? in one’s opinion是什么意思? 是to my opinion 还是 in my opinion