Can a possessive pronoun be used as a direct object, indirect object, or object of a preposition?

In this excerpt from robert burns’s poem “a red, red rose,” which two lines are written in iambic trimeter? (an iambic trimeter pattern contains an unstressed syllable followed by a stressed syllable. the pattern repeats three times per line.) o my luve’s like a red, red rose that’s newly sprung in june: o my luve’s like the melodie that’s sweetly play’d in tune! as fair art thou, my bonnie lass, so deep in luve am i: and i will luve thee still, my dear, till a’ the seas gang dry: