1、the key lies in work's development,此处where=in which
2、学校超市的顾客主要是学生,表示的是从属关系.
3、这句话换一种表述应更好理解一些,fathers often fee that it is ltheir duty to earn money for their family,it是宾语从句中的形式主语,真正的主语是to不定式.Fathers often feel it their duty to earn money for their family中it 是宾语,their duty to earn money for their family是宾语补足语.
4、so和such主要取决于真正的修饰的是谁,而不是挨着谁.这句话中,这样时髦的衣服,明显这样修饰的衣服.so beautiful a girl ,such a beautiful girl
5、你说的be devoted to在句首去掉be就表示被动了.也就是动词过去分词表示被动.此句明显表示的不是被动.devoting这种用法很常见的.
可能说的有点简单了,不明白,继续追问.