Ten sentences, one conjunction in each, and nothing on the page to say which words count. We packed sandwiches and apples for the hike. We stayed inside until the storm passed. We can walk to school if the weather is nice.
It is the natural follow-up to a sheet with a word list. The sentences run from the familiar and, but and or to because, until, when and if, so a child who has only been thinking of the short words has to widen the net.
Until is the likeliest one to be missed, since it rarely appears on early lists of conjunctions, which makes sentence six a good check on whether a child is reading for the joining word rather than hunting for a short one.