Learn Dutch: Doe je jouw huiswerk? - Are you doing your homework?

In Dutch, when you ask a question and the verb comes before jij or je (meaning you), the verb loses its -t at the end. The normal statement form is je doet (you do), but when reversed for a question, it becomes doe je (do you).

Why does the sentence use both je and jouw?

Here, je is the subject meaning you, and jouw is the possessive word meaning your. You could actually say Doe je je huiswerk? because je can mean both you and your (unstressed), but using jouw makes it clearer and adds a little emphasis.

Where is the word for are in this sentence?

Dutch does not use a separate word for are to show that an action is happening right now like English does. The simple present tense form Doe je translates to both Do you do and Are you doing in English.

What makes doen (to do) an irregular verb?

It has a slightly unusual, very short shape. The base form is just doe. You use ik doe (I do) and hij/zij doet (he/she does). The plural form for we or they is doen.