Answer:
Step-by-step explanation:
An iamb is a metrical foot consisting of two syllables, with the first syllable being unstressed and the second syllable being stressed. Here are the five iambs in the given line:
"Shall I"
"compare thee"
"to a summer's"
"day? Thou"
"art more lovely"
Note that the stressed syllables are bolded in the iambs above.