Translation guide
In Japanese education, 'second grade' refers to the second year of elementary, junior high, or high school. The term used depends on the school level.
My younger sister is in second grade.
Refers to the second grade of elementary school as a grade level, not a person.
I moved when I was in second grade.
The second year of junior high school (ages 13-14).
The second year of high school (ages 16-17).
Second year of any school, often used in conversation when context is clear.
Always specify the school level (elementary, junior high, high school) unless it's clear from context. Just saying '二年生' could mean any school.
二年生 (にねんせい) refers to a person (a second-year student), while 二年 (にねん) refers to the grade level itself. Use 二年生 when talking about someone, and 二年 when talking about the time or grade.
In second grade of junior high, English study gets serious.
I got my driver's license during summer break of second grade in high school.