The Book of Mormon contains examples of extrapositional nouns and pronouns that we would not expect in English.
John A. Tvedtnes explains:
Hebrew often uses a noun or pronoun as the direct object of the verb in one clause and a pronoun referring to the same person or thing in the following clause in a way that seems unnecessary or redundant in English. For example in Genesis 1:4, we read, “God saw the light, that it was good.” In this case, the King James Bible reflects the Hebrew wording, despite the fact that in English the normal way of saying this would be, “God saw that the light was good.”– John A. Tvedtnes, “The Hebrew Background of the Book of Mormon,” in Rediscovering the Book of Mormon, edited by John L. Sorenson and Melvin J. Thorne (Salt Lake City, Utah: Deseret Book Co.; Provo, Utah: Foundation for Ancient Research and Mormon Studies, 1991), Chapter 8
Examples in the Book of Mormon include:
Where would Joseph Smith have learnt this and how would he have remembered to include these while dictating?