Question

Yo_________por la escalera. (subir) (1 point)

Answer 1

subes

Answer 2

subo*

subir-present tense
subo-present tense
subia-past tense-

Answer 3

subo-present tense he is correct conjugate the verbs correct please

Answer 4

Spanish is my native language, so:
Infinitive: subir (in this case, climb or go up the stairs/ladder)
Conjugated in present tense:
Yo subo
Tú subes
Él/ella/usted sube
Nosotros/nosotras subimos
Ellos/ellas/ustedes suben
Vosotros/vosotras subís
I can recommend you this Spanish Website: http://www.esfacil.eu/es/verbos/conjugacion/237-correr.html
Here you can write an infinitive verb in a search engine to obtain all its conjugations.