Questions & Answers about Notar þú alltaf nýju öppin?
Why does the adjective nýju end in -u here?
This shows the weak adjective declension. Whenever an adjective comes before a noun with the definite article attached (like öppin, meaning "the apps"), it takes the weak form. The great news is that in the plural, the weak ending for all adjectives, across all genders and cases, is simply -u. So nýr (new) becomes nýju.
Why is "apps" spelled öppin instead of starting with an "a"?
The singular word for "app" in Icelandic is app. When it becomes plural, a common vowel shift called U-mutation kicks in, changing the root vowel a to ö, making the plural öpp. Adding the neuter plural definite article -in ("the") gives us öppin.
Which case is nýju öppin in?
It is in the accusative case because the verb nota (to use) forces its object to be accusative. Because app is a neuter noun, its accusative plural form looks exactly the same as its nominative plural form.
Why is there no equivalent to "Do" at the beginning of the Icelandic sentence?
English uses helper verbs like "Do" to form questions ("Do you use...?"). Icelandic just swaps the subject and the verb to make a yes/no question. So the statement Þú notar... (You use...) simply becomes Notar þú...? (Use you...?).