 Hey, Andrew, did you sign up for the picnic yet? I did sign up. I signed up just a little while ago. Good, good. How about you, Matt? No, I haven't signed up yet. I will soon. Do you want me to sign you up? I would appreciate that. Okay, now what you just heard us say is sign up for. That's a phrasal verb. We can put the pronoun inside the verb. I can sign you up or you can sign me up. And the preposition at the end is for. Sign you up for something or sign me up for something. I hope that's helpful for your English.