Question 1

Why is haja used here instead of the normal word for 'there is', há?

Accepted Answer

The word caso (in case) introduces a hypothetical situation or condition, which forces the following verb into the present subjunctive mood. Haja is the present subjunctive form of haver (there to be / to exist).

Question 2

Is haja an irregular verb form?

Accepted Answer

Yes, highly irregular! While the normal indicative form for 'there is' is just há, the present subjunctive form becomes haja. Because it acts as an impersonal verb here, it doesn't change to plural even if the noun following it is plural (for example, you would still say caso haja problemas).

Question 3

If I want to say 'If there is a fire', can I just swap caso for se?

Accepted Answer

You can change the word, but it changes the grammar rules! The conjunction caso takes the present subjunctive. However, if you use se (if) to talk about a possible future event, it triggers the future subjunctive. So the sentence would have to change to: Se houver um incêndio, onde está o extintor?

Question 4

Could I use the word fogo instead of incêndio?

Accepted Answer

Fogo would be understood, but incêndio is much more precise for this situation. Fogo is the general word for the element of fire, a campfire, or a stove burner. Incêndio specifically means an uncontrolled, destructive fire or emergency, which is exactly why you are looking for an extintor.

Question 5

Why use está for the fire extinguisher? Shouldn't a permanent fixture use é?

Accepted Answer

Even if the extintor is permanently mounted to the wall, Portuguese uses the verb estar to talk about the physical location of movable objects, people, and things. Whenever you ask 'Where is [object]?', you will almost always use onde está.

Caso haja um incêndio, onde está o extintor?

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