Spanish language Q&A Forum

What is the indirect object pronoun for

A Javier ya a Sara ____

I found the sentence, ¿por qué habría de asustar un sombrero?— me respondieron. I tried looking it up and apparently haber de can be used conditionally to express confusion of a topic. i think this is important as well as haber que, i saw it in a book although i can't remember the sentence haber que is apparently also another form of obligation like tener que

I just saw it in the forum and I think it should be added to the lesson since it is quite common. 

De quién was an option for this question: 

Mi perro, ________ me acuerdo a menudo, ha muerto recientemente.

However when I selected it I was marked wrong.

However according to this page

Using preposition a and de + el que, la que, los que, las que = to/of/from/about which/who (relative pronouns)

Should I have been marked right because quién doesn't necessarily need to pair with a lo/la?

The above is an A2 question and the expected answer is te however no guidance is given that a singular informal tense is to be used.

Couldn't le, les or os also be used here if no further context is given.

Why do you use the definitive article with "cumplir los deseos", but not with "con humildad y esperanza" ?

Algo que no entiendo :

*Aguafiestas* - party crasher ( de donde/por que agua ?)

*Agua Anoche* -  Que significa ? (water last night not possible)

Escuché en varios lugares (canción/calle), una jerga española ?

Gracias de antemano

The choices include c) salgan and d) hayan salido.  Aren't both of these subjunctive? The correct answer was c), salgan. I read through the lesson fairly thoroughly and don't see why hayan salido would not be correct as well. What am I missing? Thanks!

This word seems to change all the time! I had the wrong answer so next time it came up in a question I put the answer it gave me last time and it said wrong and gave the answer as the one I chose in the first place!  This has happened several times. How and why does this word change?