"They have to find a new car."

Translation: De måste hitta en ny bil.

[SimoneWorl]

And what is 'not have to'? I have heard you cannot say "De måste inte" but instead "de är inte tvungna"? Is that right?

[MarcinM85]

You can say "de behöver inte".

[Menelion]

have to. Why is blev tvungna incorrect?

[Arnauti]

have to is more måste. For blev tvungna, I would say were forced to in English. There is also a difference in time here. have to is present, so if you were to use tvungen it would be är tvungna instead. It's still a bit stronger than have to and closer to are forced to.

[tamara76b]

then what is equal to the english have to? heeeel i am confused

[Zmrzlina]

"Måste" or "behöver" most likely.

[Sabine444222]

But behöver was not taken as a correct answer...?