Spanish language Q&A Forum

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! 

Hello,

Can you please explain why in this exercise it is only correct to use preterito imperfecto in the third sentence: Teníamos que conseguir muchos puntos para acceder al tesoro escondido - even though the story starts in the indefinido tense. A few sentences later it jumps again to indefinido: Este juego nos ayudó a ser pacientes - while the rest of the sentences are in the imperfecto tense.

Thank you :)

I am a little confused with terminology. Are Preterite Indefinido and Preterite Perfecto the same thing? As others have highlighted, I am confused with the past perfect and preterite perfect. 

Using esquiar as an example: I skied = Yo esquié; I have skied =  He esquiado; I used to ski = Yo esquiaba; I have been skiing = Yo estaba esquiado. Am I wrong with these examples?

There has to be a way to make this stuff stick, and not make me fall asleep in the process. What can I do? I've my final on Monday so I need any help I can get.