It changes into juegan because ue is an exchange of (an) in the present form . I hope it helps !!
This isn't really a question so u need to give more info or at least 1 question
<span>Que hay de eso???? ._.</span>
1. I have to order a new cookbook today.
2. I have to go to a conference with some colleagues.
3. I should go see my patient with diabetes.
4. Today, Monday, I can see more patients.