Select the line that uses inverted syntax. i wandered lonely as a cloud they flash upon that inward eye they stretched in never-ending line for oft, when on my couch i lie

The final line (For oft, when on my couch I lie) uses inverted syntax.

The first three sentences use normal syntax: subject first, then verb. 

The final sentence, however, uses inverted syntax and places the object (my couch) before the subject and verb.

For oft, when on my couch I lie uses reverse syntax.