Por Vs Para

Front 1

Por

Back 1

Duration of time
Cause, reason
Exchange
Imprecise location
Indicates passing through or around

Front 2

Para

Back 2

Destination
Recipient
Purpose: in order to + verb, for + noun
Deadline
Comparison
Employed by

Front 3

The personal a

Back 3

when the direct object is a specific person or persons, or personalized object like a dear pet, the personal a is used before it

Front 4

Formal usted/ustedes commands

Back 4

you drop the "o" from the present indicative and replace it with the opposite.
-ar verbs would end in -e/en and vice versa.
Irregulars: hacer, poner, salir, decir

Front 5

Informal tu commands

Back 5

formed by just changing it to the third person indicative. However with the negative you use the first-person indicative and drop the "o" and replace it with "es" for -ar verbs and "as" for -er verbs.
Irregulars: di, haz, ve, pon, sal, s'e, ten, ven

Front 6

the preterite

Back 6

1. to express action that took place a definite time
2. to express a completed action in the past
3. To express successive actions or events in the past
4. The beginning and/or end of an action are stated

Front 7

the imperfect

Back 7

1. To express how life used to be
2. To express repeated or habitual actions
3. To express on going actions
4. To state time in the past
5. To express age in the past
6. To express to simultaneous actions in the past
7. To express the intention to do something in the past