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Before o (in the first person singular of the indicative present tense) and a (that is, in all persons of the present subjunctive), the so-called G-verbs (sometimes "Go-Yo verbs", "Yo-Go" verbs, or simply "Go" verbs) add a medial -g-after l and n (also after s in asir), add -ig-when the root ends in a vowel, or substitute -c-for -g-.
The progressive aspects (also called "continuous tenses") are formed by using the appropriate tense of estar + present participle (gerundio), and the perfect constructions are formed by using the appropriate tense of haber + past participle (participio). When the past participle is used in this way, it invariably ends with -o.
The so-called I-go verbs add a medial -g-in the first-person singular present tense (making the Yo ["I"] form end in -go; e.g., tener ["to have"] becomes tengo ["I have"]; venir ["to come"] becomes vengo ["I come"]). The -g-is present in the present subjunctive of such verbs. These verbs are often irregular in other forms as well.
This is done in the following way: if the verb is an -er or -ir verb such as comer, poder, vivir, or compartir, replace the ending o with an a i.e. : Yo como; yo puedo; yo vivo → Yo coma; yo pueda; yo viva. If the verb is an -ar verb such as hablar or caminar replace the ending o with an e: i.e., Yo hablo; yo camino → Yo hable, yo camine.
Examples of verbs that have anomalous stems in the preterite include most verbs ending in -ducir as well as most verbs that are irregular in the "yo" form of the present tense (including traer). In most Iberian Mainland Spanish and, to a lesser extent, Mexican Spanish, there is still a strong distinction between the preterite and the present ...
A number of multi-word constructions exist to express the combinations of present tense with the basic form of the present tense is called the simple present; there are also constructions known as the present progressive (or present continuous) (e.g. am writing), the present perfect (e.g. have written), and the present perfect progressive (e.g ...
The auxiliary language Interlingua has some irregular verbs, principally esser "to be", which has an irregular present tense form es "is" (instead of expected esse), an optional plural son "are", an optional irregular past tense era "was/were" (alongside regular esseva), and a unique subjunctive form sia (which can also function as an imperative).
Within the indicative mood, there is a present tense habitual aspect form (which can also be used with stative verbs), a past tense habitual aspect form (which also can be used with stative verbs), a near past tense form, a remote past tense form (which can also be used to convey past perspective on an immediately prior situation or event), a ...