The first thing you should know if you want to learn how to conjugate Spanish verbs in the present progressive tense is that you need two things, the verb estar (to be) for any pronoun in the present tense and the present participle of a verb. For verbs ending in -AR, the present participle is formed by dropping the ending and adding -ANDO. If the regular verb ends in -ER or -IR you add -IENDO. The present participle is the same for all pronouns. Only the verb estar is conjugated according to the pronoun. See example below.
yo estoy viajando – I am traveling
tú estás viajando – you are traveling
él/ella está viajando – he/she is traveling
usted está viajando – you are traveling (formal)
nosotros estamos viajando – we are traveling
ustedes están viajando – you are traveling (plural)
ellos/ellas están viajando – they are traveling (masculine or feminine)
Verbs ending in -IR that change the stem in present tense continue to change the stem for the present participle. Review the following:
1. Verbs changing the stem vowel from e to ie in present tense change the vowel to i for the present particle (ie → i ). Therefore preferir (to prefer) and sentir (to feel) become prefiriendo, and sintiendo respectively.
2. Verbs changing the stem vowel from e to i in present tense also change the vowel to i for the present particle (e → i ). Thus pedir (to ask for) and servir (to serve) become pidiendo and sirviendo respectively.
3. Verbs changing the stem vowel from o to ue in present tense change the vowel to u for the present particle (ue → u). Thus dormir (to sleep) and morir (to die) become durmiendo, and muriendo, respectively.
There are some irregular present participles for verbs such as caer (to fall), creer (to believe), leer (to read), proveer (to provide), and traer (to bring). The present participle ending for these verbs is -YENDO. Their present participles are cayendo, creyendo, leyendo, proveyendo, and trayendo, respectively.
If you are using the Verbarrator Spanish Verb conjugation software to learn this verb tense (and I do recommend that you use the Verbarrator for learning how to conjugate this and other Spanish verb tenses), instead of the “present progressive verb tense,” the Verbarator calls this tense is “estar PLUS gerund.”
Now you know how to conjugate Spanish verbs in the present progressive tense. Be sure to practice daily so that conjugating Spanish verbs becomes easier for you.