This is the 591st most frequent Japanese word.
先生
Teacher; instructor.
Here, 先生 refers to a teacher who is physically present in the classroom.
先生は教室にいます。
The teacher is in the classroom.
In this sentence, 先生 is used to indicate a person who teaches, specifically the Japanese language in this context.
私の先生は日本語を教えています。
My teacher teaches Japanese.
Here, 先生 is used as a form of address to a teacher or instructor, seeking assistance in learning.