spent和expend区别？
expend较正式用词，通常指为某一专门目的而花费大量金钱、时间或精力；
spend普通用词，与cost基本同义，意思是花费、消耗、度过，但主语必须是人。
例：
You don't need to spend that much money. 你不必花那么多钱。
You don't need to expend that much time in watching TV.你不必花那么多时间在看电视上。
money和spend的区别？
spend的主语必须是人，有固定短语搭配。比如某人做某事花了多长时间或者是多少钱，或者是某人在某一事情上花费了多长时间/金钱。可以是动词也可以是名词。
1. *** spend time/money on sth
比如，This assignment is so difficult that I have to spend at least three hours on it. (这个作业太难了让我不得不花最少三个小时才能完成它)
2. *** spend time/money (in) doing sth
比如，Chinese are so success on infrastructure construction that they only spent eight hours di *** anteling the overhead bridge.(中国人在基础设施建设上非常成功以至于只花了八个小时就把立交桥给拆除了)
3. spend money for sth愿意为什么花钱
比如，My money was spent for buying some fresh flowers.(我的钱花在买鲜花上了)
另，spend 还可以作为名词，指代在某一事情上的花销、花费与开销。
比如，The average spend in KFC is at least thirty dollars.(肯德基的人均消费最少三十澳币)
money的用法好像比较简单，一般是问，什么东西多少钱或者是挣了多少钱。比如，How much money did you spend yesterday？（昨天你花了多少钱）或者是，How much money do you earn per month？（你每个月挣多少钱？）
money: 钱;薪水;资金;钞票
1.We have to work within severe constraints of time and money. 我们必须在时间紧迫、资金紧张的限制下工作。
spend: 花费;度过;花销;开销
1.Stores spend more and more on crime prevention every year. 商店每年在防止犯罪方面的花费越来越多。
pay和spend区别？
spend和pay的区别：
1、spend的对象不仅可以是金钱，也可以是时间;pay只能搭配金钱。2、两者搭配的介词不同：spend的用法：spend time(money) on sth或spend time(money) in doing sth;pay的用法：pay money for sth或者pay for sth/ ***
①spend
*** . spend some time/money (in) doing sth. 花费时间（或金钱）做某事，in可以省略。
如：I spent three hours (in) fixing the model car.
*** . spend some time/money on sth. 在某事（或物）上花费时间（或金钱）
如：He often spends two hours on his homework. 他经常花两个小时做作业。
Will you spend so much money on the coat? 你愿意花这么多钱买这件外套吗?
②pay
*** . pay some money for sth. 某人为某物付钱
如：I have to pay one hundred yuan for the meal. 我不得不为这顿饭付了一百块。