Regular verbs
*AR pattern
*ER pattern
*IR pattern
*AR
AR is replaced with ando
caminando, escuchando, estudiando
*ER
ER is replaced with iendo
bebiendo, comiendo
*IR
IR is replaced with iendo
escribiendo, viviendo
Irregular progressive verbs
( caer, leer, traer ... )
( construir, huir, ir ... )
The *ER and *IR verbs which have a stem ending in a vowel will use yendo instead of the regular *iendo
cayendo
leyendo
trayendo
construyendo
huyendo
yendo
*IR stem changers
o > ue
e > ie
e > i
o > ue simple tense change becomes o > u
durmiendo
muriendo
e > ie simple tense change becomes e > i
mintiendo
sintiendo
e > i simple tense change remains e > i
diciendo
pidiendo
Reflexive
Indirect
Direct
If object(s) is/are also used with the verb, then attach them to the progressive form:
escuchándolo
mirándolo
With two objects use the RID
comprándomelo
enviándotelos