I teach students to write conclusions using PEEL (point, evidence, explain, link to the real world). It really helps students make sure they have included everything they need to hit all the key marking points. My more able students don't need any support or just a reminder of what the letters stand for on the board. I differentiate by providing the least able students with a writing frame for this and those that need some support with sentence starters. This resource is the writing frame and sentence starters.