2. Para formar el progresivo en español, se puede usar los siguiente 5 verbos en vez de ESTAR.
All of these verbs suggest movement of continued, ongoing action.
There are very slight differences in these verbs and their meanings.

3. 1.) Conjugation of verb (in location of Estar)
Formation:
1.) Conjugation of verb (in location of Estar)
2.) Formation of gerund (-ar = ando; -er/-ir = iendo; yendo; irregulares).
3.) Pronoun placement follows the same rules as learned with Estar and the progressive tense:
(no) IOP + DOP + verbo + gerundio
(no) verb + gerundioIOPDOP* (acento)
OJO: “Se” especial

4. SEGUIR = “to keep on –inging”
Yo seguí cantando toda la noche.
I kept on singing all night.

5. CONTINUAR = “to continue –inging”
Continuamos haciendo la tarea.
We continued doing the homework.

6. VENIR = “to come around (habitually) – inging”
Ellos vinieron coleccionando dinero.
They came around collecting money.

7. ANDAR = “to go around –inging”
Ella anduvo entrenándose para la carrera.
She went around training (herself) for the race.

8. IR = “to –ing more and more” (-er and -er)
Yo voy enfermándome.
I am getting more and more sick (I am getting sicker and sicker).