Questions & Answers about Я рисую карту, мне нужен карандаш и ластик.
Why does the sentence use мне нужен instead of translating 'I need' directly?
In Russian, the most common way to express needing a physical object is to phrase it as 'the object is necessary to me'. The person needing the item is put in the dative case (мне), and the needed object acts as the grammatical subject in the nominative case.
Since I need two items (a pencil and an eraser), why is it нужен instead of the plural нужны?
When a short adjective like нужен comes right before a list of subjects, it usually agrees with only the very first word in that list. Because карандаш is a masculine singular noun, we use the masculine singular нужен. If the items came before the adjective, you would use the plural: карандаш и ластик мне нужны.
Why does карта change to карту, but карандаш и ластик do not change their endings?
Карта is the direct object of the verb рисую (I am drawing), so it takes the accusative case ending. However, because of the way нужен works, карандаш и ластик are the grammatical subjects of the second half of the sentence (literally, 'a pencil and an eraser are necessary to me'). Grammatical subjects always stay in the nominative case.
Could I say я нужен in this sentence to mean 'I need'?