1、The boy caused a lot of trouble __ his parents.

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1、The boy caused a lot of trouble __ his parents.
这里所用的介词为什么是to,而不是for?
2、The camera was one of the great __ (发明) in the 19th century.
在这里,为什么发明invention,为什么要用单数形式,而不是复数形式?

1 cause sth to sb 对某人造成某事,给谁带来了什么.for sb是指为某人,若是换成buy,do等就可以用for,要根据语句的意思来判断
2.这句话的意思是相机是19世纪的一项伟大发明,所以用单数.如果是相机19世纪发明中最伟大的一项发明的话就用复数了.就是great变成greatest的话.

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