Fazermos and fizermos are different forms
A study group compares two original Portuguese sentences: «Antes de fazermos a visita, confirmaremos o horário» and «Quando fizermos a visita, levaremos os documentos». The teacher asks learners to identify the form of fazer and explain the governing construction. One learner calls both forms future subjunctive merely because both sentences concern future activities. Another calls both personal infinitives because regular-verb paradigms previously studied contained overlapping forms. A third notices that the irregular verb makes the morphological difference visible. The task requires analysis of these actual examples, not a universal rule based only on future meaning or a comparison with Spanish. No real visit, administrative requirement or examination word count is established. The group must preserve the sentence meanings while distinguishing the grammatical forms accurately.
1. Identify fazermos and fizermos in these sentences.
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Fazermos after antes de is a first-person plural personal infinitive. Fizermos after quando is first-person plural future subjunctive. The irregular verb fazer distinguishes the stems in a way that some regular verbs do not.
2. Why is a meaning-only rule insufficient?
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Both sentences refer to future activities, so future reference alone cannot select the label. The prepositional construction antes de and temporal clause introduced by quando, together with the actual forms, provide the relevant evidence.