Spanish language Q&A Forum

Why whenever I use sobre in a sentence its followed only by 'la/el'? These examples are taken from the course I'm doing on Duolingo. 

E.g. El gato esta sobre la mesa. 

But if I use debajo its followed by 'de la/el'. 

Mi celular esta debajo de la ropa. 

Is there a reason for this? 

Why does one use just 'la/el' but the other needs the 'de' to be marked correct? 

1. I find it difficult to think in terms of the Imperfect subjunctive in examples which allude to an event in the future, e.g. "Ojalá nosotros viniésemos el año que viene"... Could we also say "Ojalá nosotros vengamos el año que viene"?

2. [A comment rather than a question]: I personally prefer the "-s-" option for constructing the Imperfect Subjunctive because there is less chance of confusing it with a future construction.

If I'm correct, it appears from the quiz that "aquel" and the  equivalent "todo aquel que" forms have identical meanings.  Would it be worth adding a note in the lesson to clarify that "todo aquel que" is simply another alternative? 

In another unrelated lesson, a quiz sentence states, 'No me queda mucho dinero pero tengo para dos cervezas más.'  Where does this sentence fit in the various meanings of quedar, as explained in this lesson?

" para cuidar tus amistades" : why the personal "a" is missing here?

P.S. Me gustan musho sus grasiosos e interesantes cuentos y me ayudan musho también.

(I wellcome all corrections to my Spanish.)

Muchas gracias!

Does no debe stand for must not or don't have to ?

Regards, 

Alexander

In your explanation above under "careful", the original sense used "acabamos con" but the follow-up explanation used "nos acabamos". Are they interchangeable?