The first statement is true. The second statement is false. The imperfect tense is setting up for something to happen. The last statement is false. The preterit tense is used to describe something that happened in the past.
hi !!
Terminamos el examen ==> acabamos de terminar el examen.
acabar <em>present </em>
acabo
acabas
acaba
acabamos
acabáis
acaban
hope this helps :)
In my class, the clock is on the blackboard. Students' desks are in front of the teacher's desk. The bin always next to the door. The teacher in front of the students. My companions and I attentive in all classes.