Expressing need and obligation in Italian

You can express need or obligation in an impersonal or personal way. 

IMPERSONAL FORM - you have to options:

It’s used when you are generalizing.

1. SI DEVE + INFINITO

• • Si devono mettere vestiti pesanti quando fa freddo

 (You have to wear warm clothes when it's cold outside)

• • Si deve portare la cravatta negli eventi formali

 (You have to wear a tie to formal events)

2. BISOGNA + INFINITO

• • Se piove bisogna prendere l'ombrello.

 (If it rains we should take an ombrella)

You do not need to make changes keep it as it is even if the infinitive is followed by a plural noun!

PERSONAL FORM (you have a subject)

AVERE BISOGNO DI + INFINITO / SOSTANTIVO

• Ho bisogno di bere un bicchiere d'acqua. (with infinitive : bere)
• Ho bisogno di una borsa nuova. (with a noun : una borsa)

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