英语从句转换为非谓语从句高分找高手

英语从句转换为非谓语从句高分找高手
英语从句转换为非谓语从句有什么技巧呢?z转换后是不是都是要去掉主语 连词呢  不要复制的 复制的别他妈找骂! 
可以以下为例子或者自己举列子也行!详细点全面点 
if you stand on the building,you will get a better view of the cit  Whose is the package I amweighing?
Whose is the package I amweighing?
The man we are going to visitis most probably the pianist we saw last time.
    What is troubling them mnost isthat they have not enough farm tools
    The doctor insisted that Ishould stay indoors for days

非常感谢你的及时回答 一些东西我没写清楚!sorry 我下次注意
我看完了
过去分词done除了 做伴随状语或后置定语 是不是也表被动啊
Whose is the package I am weighing?答案是Whose is the package being wighed?
What is troubling them most is that they have not enough farm tools
.答案是What is troubling them most is their not having enough farm tools.
The doctor insisted that I should stay indoors for days 答案是The doctor insisted on my staying indoors fo