Could you please evaluate each of the following six sentences depending on whether it is natural or not? <br/><br/>(A) He has already drunk four cups of tea since I sat down here. <br/><br/>(B) He has already drunk four cups of tea since I sat here. <br/><br/>(C) He has already drunk four cups of tea after I sat down here. <br/><br/>(D) He has already drunk four cups of tea after I sat here. <br/><br/>(E) He already drunk four cups of tea after I sat down here. <br/><br/>(F) He already drunk four cups of tea after I sat here.