The difference between supimos, sabíamos, tuvimos,teníamos in the sentence
Nosotros no supimos-sabíamos que teníamos-tuvimos que terminar todo el trabjo antes del sábado.
My question
Which ones to use here in this sentence? Why can´t the other form be used? Kindly try to explain it grammarly why the one can´t be used here.
Thanks in advance!
Best wishes from late night China!