spend on 后只接名词，spend on sth.
spend in后接动词ing形式spend in doing sth.
eg：I spent one hour on my homework或I spent one hour in doing my homework注in可省略
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.
spend on sth.
spend in doing sth.
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