Learn Danish: Mange borgere har givet udtryk for deres frygt. - Many citizens have expressed their fear.

Both are grammatically correct, but at give udtryk for (literally "to give expression for") is a highly common fixed phrase in Danish. It is often used to mean "to voice" or "to state" and sounds very natural in journalistic, political, or formal contexts.

Why do we use the preposition for at the end of givet udtryk for?

The noun udtryk dictates the preposition here. When you express an emotion, thought, or opinion in Danish, you provide an expression for it. English speakers often want to use af (of), but et udtryk for is the standard Danish combination.

The citizens are expressing their own fear, so why do we use deres instead of sine?

This is a classic trap! In Danish, the reflexive possessive pronouns (sin, sit, sine) are only used when the subject is third-person singular (he, she, or it). Because the subject here is plural (mange borgere), you must use deres for "their," regardless of whether the fear belongs to them or someone else.

Why is the plural of borger formed by just adding an -e (borgere)?

Danish nouns that already end in the unaccented syllable -er—which includes many words for people or professions, like lærer or bager—usually form their plural by just adding -e. This avoids a clunky, hard-to-pronounce double-R ending.