ESL teachers sometimes need donuts. They also need writing lessons that students can finish in 20-30 minutes. Here are two activities.
Here is a high beginner+ ESL classroom activity that blends reading, writing, listening and speaking skills.
This 45-minute (or less) drill helps students learn to write 4 kinds of sentences.
This 30 to 40-minute drill helps students write sentences with the correct verb tense.