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:
Both those lines present a pattern of three iambic units, each one of two feet, which is the definition of iambic trimeter, as the question states: an unstressed syllable followed by a stressed syllable; pattern which repeats itself three times per line.
The longer lines of the poem are in iambic tetramete instead.