Combinations must be grammatically correct and logical. Remind students that they should pay attention to punctuation. This sheet has a total of eleven sentences, which allows for twenty-two students. If your class size is larger than this, just duplicate one sentence for every two extra students. If necessary, emphasize any tricky grammar structures.
Students can then work together as partners on the next activity.
By the time my brother arrives, I'll have cleaned the whole house. I didn't go out for dinner because I had already eaten. They go to the movies every Friday night. I'll be sleeping. His flight arrives tomorrow at five.