翻译一个句子啊,汉译英

由于不知你的句子的时态,
一般过去时:Our classmates were on duty on Febuary 12th.
一般现在时:Our classmates are on duty on Febuary 12th.
一般将来时:Our classmates will be on duty on Febuary 12th.

Our classmates do the school job on Feb.12.

it's 2ed feb when my classmates were on duty

Our class was on duty on Feb.12

The day of Feb 12 was the date our classmate on duty.