What is the difference between form and structure?

When analysing a text, especially a poem, it is a good idea to identify the form and structure of the text as part of your answer as it shows you understand the writer's methods (hitting assessment objective AO2) and can also show you understand the context of the text (AO3). Form and structure are not the same thing, however. The form of a poem is how it appears to you on the page and what type of poem it is, e.g. a sonnet traditionally has 14 lines, with three stanzas each with four lines, and finally a rhyming couplet to finish it off. If a text is a certain type of poem, it belongs to a certain genre which has its own associations and meanings. For example, as a sonnet is traditionally a love poem, if you come across a poem has the characteristics of a sonnet, you can tell the writer might be making a comment about love because you know the context of the sonnet form. If a poem has an closed form, it follows rules and patterns like a rhyme scheme or meter or stanzas, so you can tell that a poem has an open form if it doesn't follow any of these rules.
Structure, on the other hand, is more about how the writer has ordered everything within the text. This can be on a close level, even within a sentence. The syntax of a sentence is how the words are ordered inside it, for example, the Star Wars character Yoda sounds different to how we would speak because the structure, or syntax , of his sentences is mixed up compared to ours. Repetition is to do with structure too; the writer deliberately repeats words or sounds for emphasis, or because seeing them again might bring up new meanings. Structure is also how the text as a whole is arranged, so where something happens in a text, how long it takes to happen, and whether it is referenced again or foreshadowed is part of how a text is structured.