分析I told him that whatever positive things I had done since had been influenced

分析I told him that whatever positive things I had done since had been influenced

since是用于完成时的，现在完成时是用have been。而这个句子是过去发生的，所以是过去完成时，用had been追问这个我知道。。我想问的是had been 前面的主语应该是什么？since的意思是自从还是因为？

在被影响了之后，我告诉了他所有我做过的积极的事情

I为主语，told是谓语，him是宾语，that引导的句子是宾语从句，这其中I had done是定语从句修饰先行词whatever positive things，
since had been influenced
是宾语从句中的谓语

I told him that whatever positive things I had done since had been influenced
that 引导宾语从句， whatever positive作定语修饰从句主语things， I had done作定语从句 修饰先行词things，had been influenced作从句谓语