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Questions & Answers about Вы действительно уверены?
Why do we use the short-form adjective уверены here instead of a regular long adjective?
Short-form adjectives are used to describe temporary states, conditions, or feelings rather than permanent traits. Being "sure" is a current state of mind, so it takes the short form.
Why does уверены end in -ы?
Short-form adjectives must agree with the subject in gender and number. Because the subject here is вы (which always acts as a plural grammatically, even when used formally for one person), the adjective takes the plural short-form ending -ы.
How would this sentence change if I were speaking informally to one person?
If you are talking to a male friend, you would use the singular masculine form: Ты действительно уверен? For a female friend, you use the feminine form: Ты действительно уверена?
Why use действительно instead of a simpler word like очень (very)?
Действительно translates to "really," "truly," or "indeed." It questions the truth of the statement. While English speakers often say "very sure," Russian prefers действительно here to emphasize whether the person is truly certain.