Learn Italian: Lui dimentica sempre il portafoglio nello zaino. - He always forgets the wallet in the backpack.

nello combines the preposition in (in) and the article lo (the). We use lo (and therefore nello) before masculine nouns that start with z, like zaino. If the word started with most regular consonants, we would use nel.

Why is it dimentica sempre instead of sempre dimentica?

In Italian, adverbs like sempre (always) normally go right after the verb, not before it like they do in English. So instead of saying 'He always forgets,' the Italian structure is 'He forgets always'.

Can I just say Dimentica sempre without Lui?

Yes! In Italian, you can usually drop the subject pronoun (lui) because the verb ending already shows who is doing the action. Including lui here just puts a little extra emphasis on the fact that he is the one who always forgets it.

Is portafoglio a compound word?

It is! It combines porta (carries) and foglio (sheet or paper). So a portafoglio is literally a 'paper carrier,' which makes perfect sense for something that holds paper money!