Questions & Answers about Þér megið sitja þar inni.
Þér is the old/formal way to address one person politely (like German Sie). It takes plural verb agreement. In modern Icelandic, this is rare; people normally use:
- Singular informal: þú
- Plural: þið
So everyday speech would more likely say: Þú mátt sitja þar inni (1 person) or Þið megið sitja þar inni (several people).
Yes, þér (lowercase) is the dative singular of þú (e.g., Ég hjálpa þér = I help you). But in this sentence, Þér is a special nominative form used for formal address. Context tells you which function is intended:
- Object dative: Ég gef þér bók (I give you a book).
- Formal subject: Þér megið… (You may…).
Because the formal subject Þér requires the 2nd person plural verb form. Present tense of mega (may/be allowed):
- ég má
- þú mátt
- hann/hún/það má
- við megum
- þið megið
- þeir/þær/þau mega
So with Þér (formal singular), you use megið.