Breakdown of Je moet deze jas aantrekken.
de jas
the coat
deze
this / these
moeten
to have to, must
je
you (unstressed form of jij)
Questions & Answers about Je moet deze jas aantrekken.
Why isn't the separable verb aantrekken split up here?
Because of the modal verb moet. When you use a modal verb, the main verb gets pushed to the very end of the sentence and stays in its full, attached infinitive (dictionary) form. If you didn't have moet, you would split it: Je trekt deze jas aan (You put this coat on).
Why is it deze jas and not dit jas?
Because jas is a de-word (de jas). For de-words, we use deze to mean this. If it were a het-word, like het overhemd (the shirt), you would use dit (dit overhemd).
Does moet always mean have to?
It translates to both have to and must. Dutch doesn't make a strict distinction between the two, so Je moet simply means you are required to do it.
Can I change the word order to: Je moet aantrekken deze jas?
No. In Dutch, when you have a conjugated verb in the second position (like moet), any other verbs (like aantrekken) must go at the very end of the sentence. The object (deze jas) has to come before that final verb.