Questions & Answers about Они не хотят идти в кино.
Why didn't the ending of кино change in the Accusative case?
The word кино (cinema) is a foreign loanword in Russian, which means it is indeclinable. It never changes its ending, no matter what grammatical case it is in. It is still technically in the Accusative case here because it is the destination of the movement!
Does в кино answer the question где (where) or куда (to where)?
In this sentence, it answers куда (to where?) because they are talking about moving toward a destination. If they were already inside watching a movie, you would ask где они? (where are they?) and the answer would still look like в кино, but it would grammatically be the Prepositional case for location instead of the Accusative case for destination.
Why is the verb идти (to go) in its infinitive dictionary form?
When you have two verbs chained together like 'want to go', only the first verb is conjugated to match the subject. So, хотеть (to want) becomes хотят to match они (they), and the second verb идти just stays in the infinitive.
I know хотеть (to want) is an irregular verb. How does it change for 'they'?