Here's one example of the Petrarchan poem (sonnet)

London, 1802
by William Wordsworth

Octave - introduces the theme or problem

Milton! thou shouldst be living at this hour: - A

England hath need of thee: she is a fen - B
Of stagnant waters: altar, sword, and pen, - B

Fireside, the heroic wealth of hall and bower, - A
Have forfeited their ancient English dower - A
Of inward happiness. We are selfish men; - B
Oh! raise us up, return to us again; - B
And give us manners, virtue, freedom, power. - A

Sestet - solves the problem

Thy soul was like a Star, and dwelt apart; - C
Thou hadst a voice whose sound was like the sea: - D
So didst thou travel on life's common way , - E
In cheerful godliness; and yet thy heart - C
Pure as the naked heavens, majestic, free, - D
The lowliest duties on herself did lay. - E