Here are some examples of how Middle English might sound, compared to Modern English:
Modern English: "I am Robin Hood. I will steal from the rich and give to the poor."
Middle English: "Ich am Robyn Hod. Ich schal stelen fro the riche and geven to the pore."
While we don't know what Robin Hood would actually sound like, it's safe to assume he would be speaking a form of Middle English.