Quando viajo de autocarro, vejo tantos carros que o trânsito fica paralisado.

Questions & Answers about Quando viajo de autocarro, vejo tantos carros que o trânsito fica paralisado.

Why do we use tantos here instead of tão?
We use tantos because it describes a noun (carros). The word tanto acts like an adjective here meaning "so many" or "so much", so it has to match the masculine plural noun carros. If we were describing an adjective or an adverb (like "so fast" or "so big"), we would use the invariable word tão.
Why is it de autocarro and not por autocarro?
In Portuguese, when talking about the general mode of transport you use to travel, you use the preposition de (meaning "by"). So, "by bus" is de autocarro, "by train" is de comboio, and "by car" is de carro.
Why does the sentence use the present tense viajo after Quando? Shouldn't it be the future subjunctive?
You would use the future subjunctive (Quando viajar...) if you were talking about a specific, uncertain event in the future (like "When I travel tomorrow"). However, in this sentence, Quando viajo describes a habitual, recurring action (meaning "Whenever I travel"). For routines and habits, we use the regular present indicative tense.
Why is the verb fica used in o trânsito fica paralisado instead of está?
The verb ficar is used here to indicate a change of state, translating to "gets" or "becomes". The traffic becomes paralyzed as a result of all the cars. If you used está, it would simply describe a static condition ("the traffic is paralyzed") without showing that it's a reaction to the high volume of cars.

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