Here is a Cultural Literacy worksheet on the sonnet as a poetic form, This is a half-page document with a reading of two sentences and two comprehension questions. A simple–even elegant, if I may say so–and symmetrical introduction to the structure of the sonnet and some of the poems who wrote in the form.
If you find typos in this document, I would appreciate a notification. And, as always, if you find this material useful in your practice, I would be grateful to hear what you think of it. I seek your peer review.