Spanish language Q&A Forum

In the quiz, the sentence was :  Vas a ir con ella al teatro.  I know that it doesn't sound quite right to say "Vas a ir consigo al teatro", but why would that be incorrect?

Hi, is there some kind of rule with the verbs that stem change to ue or is it just a case of learning and remembering which ones do? 

Thanks :) 

I don't understand the use of menudo here because it means small and the question uses very often not very small.  Can you explain this to me?

I'm having a tough time knowing when to use the simple past and when to use the imperfect. Could someone walk me through the sentence below and help me understand why we use the different tenses?

¿Cuántos euros te quedan en la cartera? -Me quedan ochenta.
How many euros do you have left in your purse? -I have eighty left. 

The above is using preterite translated to present perfect. This is a subject I have some trouble understanding. Wondering if quedar is one of those examples of language that doesn't translate exactly and have to accept it as an expression used and not over think it?

Que Onda

This is one of the nuances of usted that I still haven't quite figured out. At my retail job, I often assist Spanish-speaking customers. However, I am not sure if these situations warrant using more formal language. In English, I address my customers politely with "Sir" or "Ma'am" but the language I use otherwise as I'm assisting them is more informal. I want to maintain the same tone of politeness yet casualness in Spanish as English but I don't know if it comes across as too formal. For context, I am in my early twenties and the customers I've spoken to are almost always older than me ranging from their thirties to more elderly people. Obviously, for my older customers, I would use usted but would it be necessary to use usted for people who are not that much older than me? I don't know if there is anybody here who can shed some light on this topic. In Spanish-speaking countries do retail employees typically address their customers with more formal, usted language?

Thank You

Nathan