Estar is an irregular verb, which means you have to memorize each conjugation. Still, you may notice that it's not completely different from regular verbs in Spanish. Though you may not use it very often, the 'vosotros' form will be included here for reference. The 'yo' or 'I' form...
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As with other forms of conjugation, the present progressive tense has irregularities. The two types of irregularities are (1) -er/-ir verbs ending in a vowel and (2) -ir stem-changing verbs. For example, the verb "leer" becomes "leyendo." The verb "dormir" becomes "durmiendo." ...