Breakdown of Os ângulos fotográficos melhoram a nitidez das imagens, várias das quais são lindas.
ser
to be
de
of / from / by (means of transport) / wearing (attire)
lindo
beautiful
a imagem
the image
melhorar
to improve
as quais
which / who (f.pl)
vários
several, various
fotográfico
photographic
o ângulo
the angle
a nitidez
the sharpness
Questions & Answers about Os ângulos fotográficos melhoram a nitidez das imagens, várias das quais são lindas.
Why do we use das quais in this sentence instead of just que?
Because we are using a quantifier (várias) followed by the preposition de (of). After a preposition in this partitive structure, you cannot use the simple relative pronoun que to mean "which". You must use a form of o qual — in this case, das quais (de + as quais) to mean "of which."
How does gender and number agreement work in the phrase várias das quais?
Both the quantifier (várias) and the relative pronoun (das quais) must agree with the noun they refer back to. Since they refer to imagens, which is feminine and plural, both take their feminine plural forms. If we were talking about masculine items like ângulos, it would be vários dos quais.
Is there a rule for the spelling change from singular to plural in the word imagens?
Yes, Portuguese words that end in -m in the singular change that -m to -ns in the plural. The singular form is imagem, so the plural becomes imagens. Other common examples include viagem becoming viagens and homem becoming homens.
Is nitidez always a feminine noun, and is there a pattern for words ending like this?
Yes, a nitidez (the sharpness) is feminine. Abstract nouns ending in the suffix -ez or -eza that are formed from adjectives are almost always feminine. For example, the adjective nítido (sharp or clear) becomes a nitidez, just like surdo (deaf) becomes a surdez.
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