Spanish language Q&A Forum

Hello, there is a section called "Variable Subjunctive" that has the sentence: 

no tengo un profesor que viva en madrid 

which means: 

I don't have a teacher that lives in madrid.

My question is why would this be a subjunctive, it seems like what this person is saying is a fact that he knows that he doesn't have a teacher that lives in madrid. Or maybe he's trying to say that he doesn't have a teacher that he KNOWS OF. Idk I just want to know why it's a subjunctive. thank you 

Puedes ayudarme con una oración en un libro estoy leyendo….No se si el autoro usa la palabra en una manera poética or es normalmente y correcto?  Trying to understand if Aturdir and irritar are normally used like the above verbs ‘ like gustar etc.  The following sentence from New Penguin short stories in Spanish [ de la cuenta ‘ La Indiferencia de Eva].    Me aturden las personas muy activas y, si son mujeres, me irritan. 

No se puede viajar a ese país hasta que ________ seguro.

I don't understand why this sentence is translated as ... ('we' can't travel). Wouldn't it be podemos for *we* ? I thought *puede* was singular for he/her/it

I also don't understand why the answer is *sea* and not *se*

Can someone please explain.

Hi, are the following translations correct? Especially, I am a little confused about #2 (and #4), and wonder if "No creo que tú tuviera razón." is right for #2. Thank you.

1. I do not think you are right.: No creo que tú tengas razón.

2. I do not think you were right.: No creo que tú hayas tenido razón.

3. I did not think you were right.: No creía due tú tuviera razón.

4. I did not think you had been right.: No creía due tú hubiera tenido razón.