Use pictures to make a sentence telling what someone knows/doesn't know. Students must decide if they need to use saber or conocer and conjugate it accordingly (using 1st picture to decide subject of sentence).
I've included a text version of the sentences to either be printed on the back or printed separately. If printed on back, they can be used for one student to look at and check while the other student says the sentence. Or, to self correct in pairs or individual work/activities. If printed separately, they can be used as a matching game or for students to explain why saber/conocer was used.
Differentiation is easy as well by choosing who gets which sentences and/or how many students are responsible for.
There are many ways to use these and I've listed different options in the product.