There are 9 cards with 2 sentences on each. There are also bigger cards with and, but, and so on them. The students need to read the cards with the 2 sentences. They will decide which conjunction they can use to make the 2 sentences a compound sentence. There are 3 cards for each heading. Then, they will re-write each sentence into a compound sentence using the conjunction they sorted them under.
I have the students do this in small groups of 3 - 4 students. It could also be a center.