Getting the right pronoun in Estonian is crucial, especially at the A2 level where formal and informal distinctions start to matter. 'Sina' is the informal singular 'you', used for friends, family, or people of the same age or younger. For example, 'Sina oled minu sõber.' means 'You are my friend.' This sets a casual tone.
In contrast, 'teie' is either formal singular or plural, used for respect or addressing more than one person. An example sentence could be 'Teie olete väga lahke.' ('You are very kind.'), which you might say to a stranger or a group.
A common mistake is using 'sina' in formal settings, which can come across as disrespectful. Always consider the relationship and context when choosing between these forms.
A good practice is to imagine conversations with different people, deciding if you'd use 'sina' or 'teie'. For more tips, explore https://keelix.ee/modules.