Partners or not?

I believe that sometime that students need to do the work themselves. Today, I gave a study guide to the class. I had them work on the study guide themselves. This was good because they got to find the answers themselves. They were not relying on their partner for the answer. During half way through the class if they were good they got to work with a partner to match their answers. I waited until the end of the class period to tell the students they we were going to go over the answers in class tomorrow. I didn’t even tell them that it was not going to be graded because otherwise they would not have done it and they would have come to class with a blank study guide.