younger than 26, younger than 26 yrs old, younger than 26 years,younger than 26 yrs都是对的吗?

在书面语中,YRS可用吗?

Your twin brouther ( )younger than you. you look younger than you really are Older than yesterday, but younger than tomorrow是什么意思？ i am younger than him 对还是 i am younger than he is对？为什么？ I am younger than you are. 后面为什么跟着个are啊 he looks younger ,but he is older than me -three years. i am younger than my mon and dad这个句子正确吗 高手们！请帮我一下．（究竟语法上是he is less young than me 还是he is less younger than me Your younger brother return sichuan? keen younger sister是什么意识