I am dropping off some paperwork for you.
drop off sth. for sb. 字面意思理解是：“把某物丢给某人”，含蓄礼貌点讲就是说“给某人送某物”。因此，当美国人说"I am dropping off some paperwork for you."时，他/她要表达的意思就是"I come to give you somefiles."、"The reason for my being here is to sendsome documents to you."。
Terry: Hey, you know what? I went to the Great Walllast week. Guess, what happened?
Colleague: Well, I am dropping off some paperwork for you. I don't want to listen to yur story.
①How could you enter into my office without my permission?
②Sorry to interrupt you.
③Didn't you notice that we are having a meeting? Please go out.
④Come in, please. What's up?
permission n. 允许，许可
He asked permission to leave the room.
Finally his mother relented and gave permission for her youngest son to marry.
Police said permission for the march had not been granted.