YOU SAID:

啊开始上课时呃呃说，开始打开空调开到咔咔咔

INTO JAPANESE

ああ、授業が始まるとエアコンをパチパチと鳴らし始めた

BACK INTO ENGLISH

Oh, the air conditioner started crackling when class started

INTO JAPANESE

ああ、授業が始まるとエアコンがパチパチ音を立て始めた

BACK INTO ENGLISH

Oh, the air conditioner started crackling when class started