Spanish language Q&A Forum

One of the test questions is:

"________ al colegio ha habido problemas.

Since this girl arrived at school there have been problems."

which I answered as:

"Ya que esta niña llegó",

which was marked as wrong.

Why can't I think that "Since" here has causal value, which would render my answer correct?

Is "suficiente" known more for "enough of" just like adequate and is bastante more known for "plenty" like enough, but more than just enough? I saw a native say suficiente go on about how they use suficiente=enough and bastante=plenty. I believe you can use suficiente before and after the noun, although with bastante is it only before the noun?

Could this be translated as "Let him (her, it) help you?

I am a bit frustrated with this lesson.  I guess my question is this: with my limited (A1) knowledge of Spanish, how am I supposed to know "that sometimes the feminine and masculine forms are the same" when repeatedly the test gives adjectives I do not (yet) know in Spanish?  

For example, placid.  I do not KNOW how to say placid in Spanish, thus how can I know if I should use the feminine adjective form or simply add mente?  The assumption of adjective knowledge doesn't work unless, as is sometimes done in the test, you GIVE the adjective form in the test question; example: Los coches son rápidos: van rápidamente.   In this example test question it is easy to understand rápidos (masculine form) will change to the feminine because I can SEE rápidos!  The frustrates me to get wrong when it seems to be testing me more on knowing a large range of adjectives in Spanish more than the specific assignment of adding the "ly" form! I don't see my scores getting better based on the lesson given.

I wonder to know whether the second sentence need add ´´la´´ to indicate ´´the´´ meaning or not?  Thanks.

Nosotros todavía no salimos del trabajo.        /We haven't yet left work.

Juan todavía no salió de casa.      /Juan has not left the house yet.

¿Se quita la s del imperativo de nosotros cuando "selo" lo sigue?  Por ejemplo: mostremosselo o mostremoselo

For the given sentence "Ellos __ mucho." (They were laughing a lot),
You said that "estaban riendose" is correct. 
What about "se estaban riendo" ?   That was marked incorrect in my quiz.

Gracias,  --Pepi

Hola. How do express the difference between "The students must not use a calculator" (in the examples), and "The students DON"T HAVE TO use a calculator." which has a very different meaning. Thank you! 

Why is creer not the right verb for "she thought that" . Difference between pensar and creer please?