英语翻译Ever seen a diamond and wondered whether it was real?Stu

英语翻译
Ever seen a diamond and wondered whether it was real?
Students at Nanjing Foreign Language School can choose a course on which they learn how to tell if a stone is fake.
When I visited Lushan Mountain,what I learned turned out to be very useful.
以上三个句子任选一个帮忙翻译一下并说一下其中的语法知识,最重要的是语法知识,可以没有翻译.
能不能说的具体一点，定语从句我也知道，起码给几个例句吧，就像老师上课讲的那样
第一句貌似省略了have you,正常的应该是Have you ever seen a diamond and wondered whether it was real?为什么可以省略？如果回答的是第一句，
如果是另外两句，第二句举几个既有定语从句又有条件状语从句的句子
第三句举几个主语从句的例子