How to Say "testifies" in Spanish
The Spanish word for “testifies” is “declara” — B1 level. This is a very common word in everyday Spanish.
English → SpanishB1
verbB1
in a court of law

Examples
El gobierno declara el lunes como día festivo.
The government declares Monday as a holiday.
El testigo declara la verdad ante el juez.
The witness states the truth before the judge.
Ella declara sus impuestos cada año.
She declares her taxes every year.
Two-in-One Form
'Declara' can be a statement (He/she declares) or a command (Declare!). You can tell which is which by the context of the sentence.
Confusing 'Declarar' with 'Decir'
Mistake: “Using 'declara' for everyday speaking.”
Correction: Use 'declara' for formal or serious statements; use 'dice' for just saying something casual.
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