The King James edition of the Bible was translated between 1604 and 1611. During the process, the translators included contemporary English words which they inserted to make the translation more understandable to readers of that day. Those words were specifically identified. In modern copies they are italicized.
We know exactly which words were English of the day (time of translation) for this reason.
Those words are included in the Book of Mormon "translation", word for word, raising further questions as to whether the Book of Mormon was "translated" from an original record inscribed by ancient American prophets, or plagiarized from books in the possession of those responsible for the Book of Mormon's creation.