When reading a manual, recipe, or any set of formal instructions in Portuguese, you will often see commands given using the plain, uninflected infinitive.
This "instructional" or "prescriptive" infinitive gives the text a neutral, objective tone—perfect for impersonal step-by-step guides.
| Fold the paper in half to start the origami. | Dobrar o papel ao meio para começar o origami. |
| Fold each flap on the diagonal. | Dobrar cada aba na diagonal. |
Outlining Steps
Because the infinitive doesn't need to be conjugated, outlining a multi-step process is straightforward. Just state the action verb in its base form.
| Crease the paper well to create the crease. | Vincar bem o papel para criar o vinco. |
| Overlap the points to be symmetrical. | Sobrepor as pontas para ficar simétrico. |
Negative Instructions
Telling the reader not to do something is just as simple. Place não (or a negative phrase like não... nunca) directly in front of the infinitive, bypassing the complex conjugations of the negative imperative.
| Do not tear the paper; just unfold the flap. | Não rasgar o papel; apenas desdobrar a aba. |
| Do not ever reverse the bird; just press. | Não inverter nunca o pássaro; apenas pressionar. |
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