Answer:
The syllables that should be stressed are the ones that appear underlined and in bold:
And often is his gold complexion dimmed
Explanation:
Sonnet 18 or "Shall I compare thee to a summer's day?" Is a sonnet (in Italian, a soneto is a little song) written by William Shakespeare, the writing style he had tackled was that of Iambic Pentameter. This line in which Amber has to identified the stressed syllables is written in ambic pentameter, the latter is the succession of ten "iambs" (unstressed syllable + stressed syllable),. Tu put it differently, it is a sentence that has ten syllables, the first syllable is unstressed while the second one is stressed. When you read this sonnet out loud (or anything that is written in iambic pentametre) it sounds like the beating of the heart or the galloping of a horse.
