彼は１２歳の時、つまり中学校に入学した時、英語を習いはじめた。の英語

He began to learn English when he was twelve years old, that is to say, when he entered junior high school.

I started learning English when I was a middle school student.

When he was a primary school student, he studied English conversation.

I stated studying English when I was a 2nd year junior high school student.

I just started learning English this year from April at junior high school.

I just started learning English at junior high school.

He teaches English at a middle school.

My eldest daughter started to learn English at preschool.

He teaches English grammar at a high school.

He wanted to teach English at school.

He started that when I was a third grade elementary student.

When I got to the classroom the English lesson had already begun.

When I was a university student, I went an English school for a bit.

He taught English to children at a school.

When I got to the classroom, the English lesson had already begun.

So I started to think about developing my own programming language when I was still a high school student.

He is enrolled in the general course of that high school, and is getting good grades focusing on English.

He started sit-skiing when he was in his first year of junior high school.

I learned English in middle and high school.

Can you understand why I started to study English at this age?

He was really put through it when he was in his first year at school.

Can you imagine why I started English at this age?

At the age of eighteen he commenced studying [to study] law.

My father is teaching English in middle school.

My father is teaching the English language in middle school.

My father is teaching English in junior high school.

My father is teaching the English language in junior high school.

Can you imagine why I started English at this age?

He acquired the level one English test certification.

These young people allotted many hours from their university life to study English.