We lachen om de grap. (We laugh at the joke.)
lachen takes "om" (lachen om = to laugh at). Example: We lachen om de grap. (We laugh at the joke.)
We lachen om de grap. — We laugh at the joke. The preposition om is fixed, so it doesn't change with the sentence.
Fixed prepositions come up all over the A2 exam. The platform drills them in real exam tasks, AI-graded across all five DUO sections.