Eu preciso verificar se a porta está fechada antes de sair.

I need to check whether the door is closed before leaving.

Breakdown of Eu preciso verificar se a porta está fechada antes de sair.

• eu: I
• estar: to be
• precisar: to need
• a porta: the door

Questions & Answers about Eu preciso verificar se a porta está fechada antes de sair.

Why is eu included? Can it be omitted?

Yes. In Brazilian Portuguese, eu can often be omitted because the verb form already shows the subject:

• Eu preciso verificar...
• Preciso verificar...

Both are natural. Including eu adds a little emphasis or clarity, but it is not required here.

Why is it preciso verificar and not something like preciso verifico?

After precisar when it means to need to, the next verb stays in the infinitive:

• preciso verificar = I need to check
• precisamos sair = we need to leave
• ela precisa estudar = she needs to study

So preciso verifico is incorrect because verifico is a conjugated form, and Portuguese does not normally stack two conjugated verbs like that in this structure.

What exactly does preciso mean here?

Here preciso is the first-person singular of precisar:

• eu preciso = I need

So Eu preciso verificar... means I need to check...

Be careful: preciso can also be an adjective meaning precise or accurate in other contexts, but here it is clearly the verb.

Why is se used here? Does it mean if or ?