Questions & Answers about Hún opnar munninn og hlær hátt.
Hún is the 3rd‑person singular feminine pronoun, meaning she.
Icelandic has grammatical gender, so:
- hann = he (masculine)
- hún = she (feminine)
- það = it (neuter)
The subject of the sentence is a female person, so hún is used and it stands in the nominative case as the subject of opnar and hlær.
The infinitive is að opna = to open.
Opnar is the 3rd person singular present tense form:
- ég opna – I open
- þú opnar – you open
- hann/hún/það opnar – he/she/it opens
- við opnum – we open
- þið opnið – you (pl.) open
- þeir/þær/þau opna – they open
Many regular Icelandic verbs in -a form the 3rd person singular present with -ar (opna → opnar, tala → talar, spila → spilar, etc.).