Spanish language Q&A Forum

I was wondering why there is no comma in some sentences containing a clause - for example:  

A medida que salían de la clase les devolvíamos los móviles a los estudiantes.

Conforme vayan llegando los invitados ofréceles una copa de vino.

Se comió ________ bocadillo. He ate half the sandwich.

medio was the correct answer. I put "el mitad de" which was marked wrong. 

EDIT: Maybe because I used "de" instead of "del"? Now it is being marked correct with that answer. If this is the case, shouldn't it show me that "el mitad del" is the correct answer? This is confusing.

Can como si be followed by subjuntivo presente? Please clarify.

In one of the above examples, "la pelicula" becomes "el peliculón", and in another "tasa" becomes "tazón".  Is there a rule for when to do this gender change?

Thanks,

Marcos

Wouldn't we always use "el azúcar" for phonetic reasons?

Thanks!

Marcos

Can I opt out of using the vosotros form?

should be benéfico

also wrong in the list of vocabulary at the beginning

I see that you have a full list of -iar verbs that will carry a stress mark in conjugation, and I wonder whether you have a similar list for -uar verbs. thanks

Here's the -iar verb list:

 https://spanish.kwiziq.com/learn/theme/1433458

The title of the page is:   forming el Imperfecto Progresivo con estar + gerundio  but the next paragraph jumps to the Pretérito Imperfecto:

“In the case of El Pretérito Imperfecto, this is how the progressive tense is formed.”

Is the pretérito imperfecto and the imperfecto progresivo the same tense, just a different name?

Thank you.

Frankie