1°) Zero conditional: "If Marley wants to exercise, walk or run with him twice a day" (segment of the film "Marley & me")

This sentence it's an example of zero conditional because use the simple simple present in both clauses. This conditional talk about things which are always true (science facts and general truths). In this example the "if clause" talks about the condition and the "result clause" talks about what happens if the condition occurs.