report to ; report it to ; report back to有什么不同？

I asked him to reported to me after the job was completed.请问，这里的report to me 换成 report it to me或 report back to me意思是否一样？另外还想问一下，completed在句中是形容词还是动词被动？

I asked him to report to me after the job was completed.

以下三个词组都可以说，但不是在上面的句子中替换。

1. report to sb. ——report 不及物动词，只说明向某人报告，具体内容不详。

2. report it to sb. ——report 及物动词，说明把某事向某人报告，有具体内容。

3. report back to sb. ——report 也是不及物动词，只说明向某人报告，具体内容不详。但该词组含有另外一层意思：back （反馈）。与第一个相比，该词组含有事先需要需要反馈的报告。

was completed 是被动语态。动作意义明显。