小学校の子供に「 何年生？」と聞くときには、what grade are you in?。 大学は what year are you in? 。むこうのは小学校12年生まであるので、what grade があてはまる（と思う）。
0;38 what grade are you in? four. you're in fourth grade. 何年生だ？4年。4年坊主か。
Child Asks Obama:"Why Do People Hate You?"
1:08 what year you guys are in? senior. 君たちは何年生？（大学の）四年生です。注；freshman, sophomore, junior, senior
President Barack Obama Makes Surprise Visit
3:33 what year are you in now? third year.
Meet Dr. Herbert Wertheim, The World's Happiest Billionaire | Forbes
1:01 and what grade are you in? third. 注；2:50 11th grade, junior year 3:17 12th grade, your senior year of high school
13 Years of First Day of School Interviews
参考リンク
http://bridge-english.blogspot.com/2017/05/k-12.html K-12 幼稚園から高校卒業までの一貫教育
練習問題解答
b-0770 what year are you in
b-1292 what month are you in
b-6762 a 21-year-old senior
