What are the difference between the three sonnet types; Petrarchan, Spenserian, and Shakespearean/English

Verified Answer :

maxday

The difference is in their structure - both have fourteen lines of iambic pentameter, but they are organized in different ways. 

Spenserian sonnets are composed of three quatrains (stanzas of four lines each) and one couplet (a stanza of two lines that rhyme).