Breakdown of É no laboratório onde o físico trabalha.
ser
to be
onde
where
em
in / on / at
trabalhar
to work
o laboratório
the laboratory
o físico
the physicist
Questions & Answers about É no laboratório onde o físico trabalha.
Why do we use É ... onde instead of just saying O físico trabalha no laboratório?
This is a cleft sentence used to emphasize exactly where the action happens. By placing no laboratório between É and onde (It is ... where), you highlight the location, often to clarify or correct someone (for example, emphasizing he works in the lab, not in a classroom).
Why is it no laboratório and not just o laboratório after É?
In Portuguese emphatic structures, the focused part must keep the preposition it would need in a normal, flat sentence. Because you work in a place (trabalhar em), the preposition em merges with the article o to become no, and it must stay attached to the noun even when moved to the front for emphasis.
Could I use que instead of onde in this sentence?
How do I know físico means 'physicist' here and not 'physical'?
While físico is indeed the adjective for 'physical', grammatically it is acting as a noun here because it is directly preceded by the definite article o (the). The context of someone working in a laboratory also confirms it refers to the profession.
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