Hello, I have this homework assignment that is due tonight a

Hello, I have this homework assignment that is due tonight and I can NOT figure out these two sentences. Here is the instructions:Build sentences from the words below. ¡OJO! Be careful to add prepositions where necessary. I am given the structure of the sentences:7. yo / conocer / a todos mis colegas / la universidad 8. pero / yo / no saber / sus nombres My answers were: 7. Conozco a todos mis colegas a la universidad. 8. Pero, no sé sus nombres.I am incorrect and don’t understand why.