in 时间>一天
in spring
in April
on 时间=一天
on Monday
on Sunday
at 时间<一天
at three o'clock
at five o'clock
at seven o'clock
in the afternoon
in 在……期间,在……之内表示不确定的时间段,morning ,从凌晨开始到中午前属于时间段,所以用in
go to 后面加名词
go to school
go to the park
有the表地点,无the表动作
go后面加副词
这儿here不能吐to,那儿there不能吐
家里home不能吐,国外abroad不能吐
go here
go there
go home
go abroad
*I can handle myself
it's one of the kind
I'm on your side
don't get me wrong
what if you are wrong
we have to go back
it's getting late
come on in
play the piano
what are you up to?