Spanish language Q&A Forum

What are the verb endings in this tense?  Although it is noted that the verb stem is the same as in the future tense, I do not find a list of the verb endings anywhere.  

There was a sentence about monuments that was asking me for which form of "arabe" that I should have used. I put "arabes" but it was marked wrong and it said that it should be arabe - is that correct and are there any more adjectives like this that are invariable in both the singular and plural?

This is the best audio so far! Crisp and clear and nicely spaced. Thank you, Silvia!

yo cantaba en un grupo 

is there a difference between the above?

do they both mean I used to sing?

Me cancelaron el viaje, cosa que me fastidió mucho.

They cancelled my trip, which annoyed me a lot.

this sentence uses cosa que in the middle of the sentence

the notes state otherwise using la cosa que and it says only for beginning of the sentence not middle

am i right to conclude, cosa que = lo que in the middle of the sentence, whereas la cosa que = lo que in the beginning of the sentence.

can i also further conclude below

Le encantan los documentales de historia, cosa que/que/lo que/lo cual (yo) encuentro aburrido = I find [the fact] that she loves history documentaries boring.

cosa que/que/lo que/lo cual are all interchangeable and replacement with no change in the meaning in the middle of the sentence?

la cosa que/lo que for the beginning of the sentence.

this is a helpful lesson with good examples.

but I’m confused.  the lesson says:  The verb is conjugated in the 3rd person singular or plural, according to the subject in the sentence.

aren’t the singular or plural things the objects of the sentences?

I was doing a writing exercise, and I put "estar por" instead of "estar a punto de" and I was corrected and "estar por" wasn't shown as an option. I'm wondering why since I have heard and used this expression frequently. 

The phrase that has to be translated was, "He was about to go out the door when..."