Breakdown of Если ты хочешь купить дом, то тебе нужно копить деньги.
дом
house
ты
you (singular)
хотеть
to want
деньги
money
Questions & Answers about Если ты хочешь купить дом, то тебе нужно копить деньги.
Why is it ты хочешь in the first part, but тебе нужно in the second?
In the first half, ты is the regular subject of the verb хотеть (to want). In the second half, Russian uses the impersonal word нужно (necessary). With words like нужно, the person who needs something is put in the Dative case (тебе). This is the exact same Dative case you use when expressing someone's age!
What is the purpose of the word то here?
In Russian, если (if) is very often paired with то (then) to connect the two halves of a conditional sentence. It works just like the English "If... then..." structure. You can sometimes drop то in everyday speech, but using it makes the sentence flow very naturally.
Why use the perfective verb купить (to buy) but the imperfective verb копить (to save)?
We use the perfective купить because buying a house is the final goal—a single, completed action. We use the imperfective копить because saving money is an ongoing, continuous process that takes time to do.
Why doesn't the word дом change its ending since it is the object being bought?
Дом is indeed the direct object here, which means it must be in the Accusative case. However, because дом is a masculine, inanimate noun (a non-living thing), its Accusative form looks exactly the same as its basic dictionary form.