spend in doing something
或spend in somewhere
在…上花费
I spent a week in Spain this summer.今年夏季我在西班牙度过了一星期.
Don't spend such a lot of time in dressing yourself.别花那么多时间来打扮自己.
He spent much time correcting my grammar.他花了很多时间来改我的语法错误.
spend on something 把…花在…
He doesn't spend much time on his homework.他花在作业上的时间不多.
Jack spent an hour on his homework yesterday.
Jack spent an hour in doing his homework yesterday.
Jack spent an hour doing his homework yesterday.
即on后直接跟名词,如果是动词,就用in+-ing形式,in可以省略。