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O cientista está a trabalhar no laboratório.

O cientista está a trabalhar no laboratório.
The scientist is working in the laboratory.
From Lesson 227:Formal causal connectors (já que, visto que...)·Portuguese (Portugal)

Questions & Answers about O cientista está a trabalhar no laboratório.

Why is it O cientista and not O cientisto?
Words ending in -ista, like cientista, artista, or dentista, have the same spelling for both masculine and feminine. You show the gender by changing the article before it, so a male scientist is o cientista and a female scientist is a cientista.
Could I use trabalhando instead of a trabalhar here?
You could, but estar a followed by the infinitive (trabalhar) is the standard way to express ongoing actions in European Portuguese. Using the gerund (trabalhando) is much more common in Brazilian Portuguese or in specific regional dialects of Portugal.
Why use está instead of é for someone who is permanently a scientist?
While being a scientist is a permanent profession (which would use the verb ser, as in ele é cientista), this sentence describes the temporary action of what he is doing right now. We always use estar as the helping verb for continuous actions like estar a trabalhar.
Why does the sentence use no before laboratório?
The word no is a mandatory contraction of the preposition em (in, on, or at) and the masculine singular article o (the). Because laboratório is a masculine noun, we must combine them into no to say 'in the'.

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