Verbs like sonreír conjugate like reír but have accentuated "o" in 3rd pers., sg. in indicative past simple due to accentuation rules
3 verbs follow this model. Below an extract:
To see other models, refer to Model Table
Based on the ending, you can identify features that different verbs have in common. Click on the verbs above to see their conjugation tables and explore their conjugation patterns.