The subject of a sentence and the principal verb should not, as a rule, be separated by a phrase or clause that can be transferred to the beginning. a) Wordsworth, in the fifth book of The Excursion, gives a minute description of this church. b) In the fifth book of The Excursion, Wordsworth gives a minute description of this church. a) Cast iron, when treated in a Bessemer converter, is changed into steel. b) By treatment in a Bessemer