To express a past plan that did not materialize or to give excuses:
use the imperfect of ir + a + infinitive
Conocer in imperfect:
knew (someone or some place)
Conocer in preterit
met for the first time- begant to know (someone or some place)
Saber in imperfect:
saber in preterit:
found out (something)
no querer in imperfect
didn't want (to do something)
No querer in preterit
refused and didn't (do something)
no poder in imperfect
was-were not able (to do something)
no poder in preterit
was-were not able and didn't (do something)
tener que in imperfect
had to-was supposed to (do something, but didn't necessarily do it
tener que in preterit
had to and did (do something)
Lo + adj. and lo que
1. use the word Lo, followed by a masculine singular adjective to express abstract ideas
ex: the sad thing is... the good part was...
2. Lo que is used to express the thing that or what, whenever what is not a question word.
ex: the thing that they were interested in... , The thing you propose is absurd...
unintentional se : to express accidental or unintentional occurrences
1. to express accidental or unintentional occurrences, use the following construction with se and an indirect-object pronoun: se + ind-ob. pronoun + singular verb + singular noun or plural verb + plural noun
To discuss past occurrences you can use:
preterit, imperfect, pluperfect, present perfect
You use present perfect to:
-Discuss events that have taken place in the past and are relevant to present or to past events that may continue-begin in the present.
-With the expression Alguna vez to ask the question.. "have you ever..."
-Ya (already, yet) is mainly used only in spain with the present perfect in affirmative questions. Todavía is used in spanish speaking countries.