I conduct a language group 2-3 times a week and I start out each class with a writing warm up. The prompt changes each week, but the format remains the same. The students know my expectations for writing and can support their words with a picture. It's a great warm up because the students that finish quickly can be challenged to find additional parts of speech, add sentences to their writing, or draw a more detailed picture. The students that need additional support and work at their own pace and finish within the set amount of time.
I left the 'prompt' section blank so you can edit it for each use. See my other product of suggested warm up topics for examples. The prompts can also be edited to meet the grade level of each of your groups.