in/on/at this weekend是in this weekend,on this weekend还是at this weekend in on at 关于时间的用法在下周 next week 前的介词用哪个

in/on/at this weekend是in this weekend,on this weekend还是at this weekend in on at 关于时间的用法在下周 next week 前的介词用哪个
in/on/at this weekend
是in this weekend,on this weekend还是at this weekend
in on at 关于时间的用法
在下周 next week 前的介词用哪个

in/on/at this weekend是in this weekend,on this weekend还是at this weekend in on at 关于时间的用法在下周 next week 前的介词用哪个
in通常用于较长的时间段.如：in the year of 1990
on通常用于指特定某一天,如：on June 3rd,1999
又如：on Saturday morning（特例）
at就当然用于某个具体时间啦,比如：at nine o'clock