This is the 414th most frequent Swedish word.
tas
"tas" - "to be taken" (passive form of "ta").
Here, "tas" is a passive voice verb form of "ta", indicating that the action "must bring" is conceptualized in a passive framework.
Böckerna måste tas med till lektionen.
The books must be brought to the lesson.
Here, "tas" signifies the necessity of considering the situation seriously, using "ta" in a passive voice.
Situationen måste tas på allvar.
The situation must be taken seriously.
Here, "tas" uses the passive form of "ta" to denote that the action of making a decision will occur in a passive construction.