Questions & Answers about Hvar megum við leggja?
Why do we use leggja here without the infinitive marker að?
Because it follows the modal verb mega (here in the 'we' form, megum). Just like in English, Icelandic modal verbs are followed directly by the bare infinitive of the main verb without að (to).
I thought leggja meant 'to lay' or 'to put'. Why does it mean 'park' here?
You are right! Leggja literally means 'to lay' or 'to place'. When talking about driving, it is short for leggja bílnum (to park the car, literally 'to place the car'). Icelanders commonly just say leggja when it is obvious you are talking about parking.
Why is the verb megum placed before the subject við?
This happens because of the V2 (verb-second) rule. In Icelandic questions that start with a question word like Hvar (where), the verb must take the second slot. So the order becomes Question Word + Verb + Subject.
How do I know to use megum instead of another form of the verb mega?
Megum is the specific present tense form of the verb mega (may/to be allowed to) that matches the pronoun við (we). If you were asking 'Where may I park?', you would use the 'I' form and say: Hvar má ég leggja?