This is the 2630th most frequent Japanese word.
教える
To teach; to instruct.
'教える' here is used to indicate the act of instructing or teaching a subject, i.e., English in this case.
私は英語を教えています。
I teach English.
'教える' is employed in the passive form here, wherein the speaker receives instruction in mathematics from another individual.
彼に数学を教えてもらった。
I was taught mathematics by him.
'教える' here is used in the imperative form, requesting the listener to explain or instruct regarding a topic.