Present Progressive    Grammar The Progressive Tenses
Introduction The present progressive tense is formed with the
auxiliary verb estar plus a main verb in its present participle
form (e.g. estoy escribiendo). The present participle is formed
with the stem of the verb plus -ando (for -ar verbs) or -iendo
(for -er and -ir verbs). For example:  hablar -> hablando
(example sentences) comer -> comiendo (example sentences) beber
-> bebiendo (example sentences) vivir -> viviendo (example
sentences)  In the case of -ir stem changing verbs the stem
vowel changes. For example:  preferir -> prefiriendo  pedir ->
pidiendo  venir -> viniendo  Verbs with stems that end in a
vowel also have an irregular form:  caer -> cayendo (example
sentences) oír -> oyendo (example sentences) traer -> trayendo
(example sentences)  The verb estar must be conjugated to match
the subject pronoun. For example:  Yo estoy comiendo. I am
eating. Tú estás cantando. You are singing. Él está hablando. He
is speaking. Ella está bebiendo. She is d