Spanish language Q&A Forum

In an e-mail entitled: "A new error has been submitted by a user [#252851]", Laura Lawless today (4th May) asked me to repost this here:

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Question 6 in the [first] 'StudyPlan' quiz which I did on 3rd May, required a translation for:

"You two, wash your hair!"

The 'vosotros' part was already provided for us, so I chose:
Vosotros dos, ¡A lavaros el pelo! 

However, I was marked incorrect, because you said that another possible option is:
Vosotros dos, ¡A lavarse el pelo!

>> But surely the "-se" suffix is not compatible with "vosotros"? … i.e., it has to be '-os', [only '-os', not both].

There was a question in one of the quizzes I took and it led me to this grammar topic (questions with qué):

Which flowers do you prefer?  

¿ _____ flores prefieres ? 

I put cuales in the blank, but was marked wrong, it said the answer was qué. 

I went to the lesson on cual/cuales (interrogative pronouns) and there was a sample sentence referring to flowers, using cuales prefieres.  

In the English translation to the quiz it uses which and I assumed that a select few flowers were being referred to, thus the answer should be cuales. It is a bit ambiguous. 

Where does “eso” fit in, and could it be used in the example below? If so, how would they be different?

 I think I always use “eso” in these cases; never esto. Wondering if I’ve always been wrong.

“ Esto no es lo que yo dije.

I would have thought that A had similar structure to B, as in action#1 was interrupted by action#2:

A: Te ________ hasta que me aburrí y me fui.

I was waiting for you until I got bored and left

B: Ella estaba lavándose el pelo cuando él llegó.

She was washing her hair when he arrived.

But the answer to A was “estuve esperando” not “estaba esperando.”

Does it mean that in B the woman didn’t stop washing her hair even the man arrived, but in A the waiting totally completed?

I'm almost 2 years into learning Spanish and I get lost after hearing a couple of words if I close my eyes.  I watch shows and listen to Spanish podcast, and my ear for Spanish has not developed at all.  What could I possible do to change this?

How do I know when to shorten "cientos" to "cien"? Is is only when I am saying "100 things (cien cosas)" but I say "cientos" if there are more (ciento y uno cosas)?

Los adultos compran este calendario para los niños porque tienen chocolates y son deliciosos.

Tienen is plural while calendario is singular. So who have the chocolates? The adults or the children? Neither makes sense.

This sentence is funny in a way because you could read as the children have chocolates and the children are delicious. I guess the adults buy the calendar to lull the children, to capture them and eat them. Yum, delicious children:-)