Come April, English classes will become mandatory for fifth- and sixth-graders, but a 29-year-old elementary school teacher in Tokyo has heard the concerns of her overwhelmed colleagues, especially the older ones, who have neither taught the language nor studied it since their university years decades ago.

Preparing for the English classes is a new burden for teachers. Some believe they must teach detailed rules of grammar and demonstrate proper pronunciation, even though this isn't required.

"Many teachers are considerably repulsed. They feel they can't make mistakes and fear they may speak incorrect English" during the lessons, said the Tokyo teacher, who did not want her name used.