Your express mail from Germany is kept here due to the lack of your detailed address 我对此句有疑点

题目

Your express mail from Germany is kept here due to the lack of your detailed address 我对此句有疑点
1,your express mail from germany 是不是定语从句.
2.is kept 是什么语法,过去分词前加is 不是被动语态吗?
3.lack 后面可以不加of 为什么要加啊
三个问题我不懂请讲讲

答案

1 严格来讲也算是,可以还原成your express mail which is from germany,不过随着语言的发展,这类介词+名词的后置定语结构可以说已经自成一体,译为你那份从德国寄来的快件2 是被动,意思就是被搁在这里3 lack 作动词时...