简而言之:
in 比较大范围些:
从世纪到星期都是用in
in the 21st century
in June
in the week
in the year
in the month
in summer
in the summer of 2014
而on小一些:
天就用on
也包括具体的某天的上下午晚上
on Saturday;
on June 1st
on a sunny morning
on the afternoon of Saturady
简而言之:
in 比较大范围些:
从世纪到星期都是用in
in the 21st century
in June
in the week
in the year
in the month
in summer
in the summer of 2014
而on小一些:
天就用on
也包括具体的某天的上下午晚上
on Saturday;
on June 1st
on a sunny morning
on the afternoon of Saturady