Spanish language Q&A Forum

Why is there so much inconsistency with questions of this type? "Son" was marked incorrect an an answer though it translates to 'The product in this store are plastic" yet a very similar question today of "De qué _______ esa escultura?" has "es" as an allowed alternate even though escultura is a feminine noun. Regarding this first question, is there a significant difference between (being plastic) and (being made of plastic) that we're supposed to know?

Whi are no commas after rebanadas de pan duro   3 litros de caldo de carne etc when she is mentioning some of the ingredients.  Some have commas but others like  I mentioned  do not?

have commas but not the 

Pienso que Marta no esta celosa.

A little off topic, but consider:

1. donde, adonde/a donde

2. dónde, adónde/a dónde

and for that matter (or maybe especially for the case of), 

3. quizá, quizás 

Within each group the various options can be used interchangeably. But what factors influence the chosen form? For example do some people tend to use the same form all the time? Do people just randomly use all the forms equally? Do some localities tend to use one form more than others? Is there a pronunciation efficiency issue (similar to y and i  or  o and u, but not a hard-and-fast rule)?

I guess my questions especially apply to quizá versus quizás. 

I gave the answer Ustedes son they said it was incorect and should have been ustedes eres

What are the differences in usage/nuance between con lo cual vs. conque?

Is there a list anywhere of which adjectives take which prepositions? I’m C1 level and still make mistakes at times! Would be great to have a comprehensive list! 

1. In the second sentence, "para que te acuerdes de que me he portado muy bien"...Why isn't recordar accepted here?

2. In the sentence, "Además, desearía que ayudaras a las personas enfermas"... why isn't "ojalá que" accepted as a translation of "I hope"?

“Nunca hubieras pensado que hubiese tantas formas de disculparse.” Hola, this sentence is from the B2 Listening exercise on how to apologize in spanish. I don’t know why Nunca triggers the imperfect subjunctive. Maybe this example could be included in the examples in this lesson? Muchas gracias, Shirley.