Question 1

Why is fica used here to mean "goes" instead of a verb like vai or torna-se?

Accepted Answer

In Portuguese, ficar (literally "to stay") is the standard verb for expressing a change in an emotional or physical state, much like "to get" or "to go" in English. You use ficar when a dog goes crazy, a person gets angry, or someone gets sick. Tornar-se is reserved for more permanent or profound life changes, like becoming a teacher.

Question 2

Why does quando take the present tense (vê) here instead of the future subjunctive? I thought quando triggered the subjunctive.

Accepted Answer

The word quando only triggers the future subjunctive when you are talking about a specific, uncompleted action in the future (for example, quando vir meaning "when it sees" on a specific future occasion). Because this sentence describes a habitual, recurring reality (it happens every single time), it correctly uses the present indicative.

Question 3

Is there a difference between doido and louco in this context?

Accepted Answer

Both translate to "crazy" and are largely interchangeable in casual speech. However, doido is often preferred for temporary, hyperactive, or silly behavior, which is perfect for an excited dog. Louco works too, but it can sometimes carry a heavier, more literal meaning of clinical insanity depending on the context.

Question 4

Could I include the pronoun and say quando ele vê a bola?

Accepted Answer

Yes, it is grammatically correct, but it sounds less natural. Portuguese frequently drops subject pronouns when the subject is already obvious from the context. Since o cão was just established in the first half of the sentence, adding ele feels redundant to a native speaker.

O cão fica doido quando vê a bola.

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