spend on 与 spend in的区别：
spend on是指在什么事上花费了时间，后面接的是名词；而spend in doing是指在做什么事上花费了时间，后面接的是动词-ing。
spend on 与 spend in的用法：
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 in doing
Spend on
Spend money for something
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