问题描述：
no one witnessed the whole process of shooting down the helicopter 在这句话后面加一个定语从句
表明是“我”干的,怎么加?
问题解答：
我来补答
No one witnessed the whole process of shooting down the helicopter,which was done by me.
比较拗口.
其实说no one witnessed the whole process of my shooting down the helicopter 就可以了.
不过这句话好刺激啊
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再问： 去掉逗号行不行 我有两种方法 一种是你的 ，但是没有逗号，另一种是 which was my done，两种从语感上感觉怪怪的。其实刚开始我加的是which i had done，不过感觉明显不对。
再答： which was my done说不通。去逗号也可以的。my shooting down the helicopter 最合适，符合英美人习惯。
再问： 主要是想强调下"是我干的"，直接加个my的话感觉上是很随意的 no one witnessed the whole process of shooting down the helicopter which had been down by me，顺便检查下这个最终版是否合适吧
再答： no one witnessed the whole process of shooting down the helicopter which had been done by me. done拼错了，这样讲比较拗口，my doing sth也可以是正式的。
