Oraciones Sustantivas: Contradicción de las reglas gramaticales

[JSK]

Hola a todos


since my Spanish profesor at the university wasn't able to help me because she didn't even understand what my question was (as always...) I've just registered for the forum. I hope that someone may help me out, I really don't understand this thing about Las Oraciones Sustantivas:


The second law of the first rule in our spanish book says => if the subject of verb 1 and the subject of verb 2 are not the same, the second verb has to be in subjunctive form. Example: Espero que nos veamos pronto.

Two subjects here, Subjunctive form needed, alright, easy thing.
Now on the next page is the second rule with the following laws:

=> If verb 1 is affirmative, verb 2 goes in Indicative form. Example:
Pienso que debemos irnos ahora.
=> If verb 1 is a negative question, verb 2 goes in Indicative form. Example: ¿ No comentaste que era fácil ?


It really irritates me because the two rules seemingly contradict each other. What am I supposed to write if I have a sentence with two subjects but the first verb being affirmative? Does one law outweigh the other one?


JSK

P.S.: My stupid teacher said about this: "Bueno, tienes que saber cuándo es necesario usar regla una y regla dos." Funny honey she is.... I'm not a spanish native and well, I DON'T know from instinct or something. Do you guys maybe have another idea how I can logically teach myself and see how and when to use which of the rules? There are many sentences in the exercise I stumble over, because I just don't notice a difference this is my very last grammar class in Spanish at the Uni and it gives me a pain in the ass. I have tons of questions, in fact, but this is the most basic one so let's start with this one first.