Answer:
And summer's lease hath all too short a date
Nor lose possession of that fair thou ow'st
Step-by-step explanation:
Iambic pentameter is a form of poetical writing style where there are ten syllables/ iambs / meters in a line. These words in each line will also be an alternation between an unstressed and a stressed syllable.
Among the lines given in the question, the last two lines are written in an iambic pentameter form. The lines are from William Shakespeare's "Sonnet 18",
And summer's lease hath all too short a date
Nor lose possession of that fair thou ow'st
The stressed words are underlined, thus the evident alternating unstressed and stressed meter form. Thus, these two lines are written in an iambic pentameter form.