Answer:
Consecutive pairs of rhyming lines.
Explanation:
A couplet in a poem or any literary work is the presence or use of two successful rhyming lines, in consecutive pattern. The rhyming schemes, the meter form and even the rhythm are all similar in these couplets.
"To My Dear And Loving Husband" by Anne Bradstreet have a consecutive couplet form from the first till the eighth line, where the rhyming, the rhythm and meter form are exactly the same (10 syllables). And then from the last two lines have the same couplet form (11 syllables).
Likewise, Phillis Wheatley's poem "To The King's Most Excellent Majesty" also have the same pattern of couplets, 10 syllables in all the lines except the first where it is just 6 syllables.
Thus, the couplet pattern in both the poems is the consecutive pairs of rhyming lines.
