Questions & Answers about Vi måste ju ha ryggsäcken.
What exactly does ju add to the meaning of this sentence?
The word ju is a modal particle used when the speaker believes the listener already knows or agrees with what is being said. It translates roughly to "as you know," "of course," or "after all." Here, the speaker is reminding the listener that the backpack is obviously necessary.
Why is ju placed between the two verbs, måste and ha?
In a standard Swedish main clause, sentence adverbs (like inte, ofta, and modal particles like ju, väl, or nog) come immediately after the first, conjugated verb. Since måste is the first verb, ju has to come right after it, before the second verb ha.
Why do we use ha instead of the present tense har?
Because it follows the modal verb måste (must). Just like in English, modal verbs are followed by the infinitive (base) form of the next verb. So we use the infinitive ha rather than the present tense har.
How is the word ryggsäcken formed?
It is a compound word combining rygg (back) and säck (sack or bag). The -en at the end makes it a definite noun, so it means the backpack instead of just a backpack.