I just wrote sonriais in a blank on a test and it marked my answer "almost right", and gave the right answer as "sonriáis".
that is because the accent is missing in your answer. Sonriáis needs the accent on the "a" as per rules for accentuation in Spanish; it is a word that is stressed on the last syllable and ends on an -s, therefore the written accent is needed.
Sign in to submit your answer
Don't have an account yet? Join today
Test your Spanish to the CEFR standard