YOU SAID:

you have'nt done a single lesson in over 3 months

INTO JAPANESE

3か月以上レッスンを1回も受けていない

BACK INTO ENGLISH

Haven't taken a lesson in over three months

INTO JAPANESE

3か月以上レッスンを受けていない

BACK INTO ENGLISH

Haven't taken lessons for more than 3 months

INTO JAPANESE

3か月以上レッスンを受けていない

BACK INTO ENGLISH

Haven't taken lessons for more than 3 months