Questions & Answers about Wij vinden het indrukwekkend dat jij zo zuiver zingt.
What is the purpose of het in this sentence?
Here, het is a provisional object (voorlopig lijdend voorwerp). Because the real object of the verb vinden is the entire long clause dat jij zo zuiver zingt, Dutch uses het as a temporary placeholder before the adjective. It works just like the English 'it' in 'We find it impressive that...'
Can I skip het and say Wij vinden indrukwekkend dat...?
No, you cannot leave it out here. When you give an opinion about a dat clause using a verb like vinden and an adjective like indrukwekkend, the placeholder het is mandatory.
Why does the verb zingt go at the very end of the sentence?
The word dat introduces a subordinate clause (bijzin). A major rule in Dutch grammar is that all verbs in a subordinate clause are pushed to the end, which is why zingt comes after zo zuiver.
I know zuiver usually means 'pure' or 'clean'. Why does it mean 'in tune' here?
In Dutch, zuiver is the standard word used to describe a musical note or voice that hits the exact right pitch. So singing zuiver means singing perfectly in tune, without any flat or sharp notes.