みたいになることがあります。関係代名詞のwhoが省かれ、someone at the door が主語で、wants が述語になるわけです。
I think (that)とかも副詞っぽく扱われて、副詞になれば文のどこにでも一応は置けるので、その位置が引越しすることもありますね。
I think that he is one of the best lawyers in this town.
I think he is one of the best lawyers in this town.
He is, I think, one of the best lawyers in this town.
He is one of the best lawyers in this town, I think.