This consonant is absent in the singular present tense forms, but appears in other forms. These verbs also characteristically have a past participle ending in -i . Apart from the behaviour of the characteristic consonant, this verb pattern is very similar to the regular -ir pattern, but without -ss- before its endings.
Use auxiliary (helping) verbs with the past participle form of the base verb. Distinguish between usage of simple future and future perfect forms of verbs. Use verbs in future perfect tense in affirmative, interrogative and negative sentences.
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future tense vs future perfect tense