"The books are in my brother's green suitcase."
Translation:De boeken zitten in de groene koffer van mijn broer.
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Indeed this can be confusing. A rule of thumb is that things that can (theoretically) fall over staan (auto, fiets, paal) and things that can't liggen (vloer, grasveld, berg). For some things it depends on their position het boek staat and het boek ligt, de vrouw zit and de vrouw ligt and de vrouw staat. Then you have things that are inside something else, these zitten.
- de boeken zitten in de koffer (the books are in the suitcase)
- de eieren zitten in de mand (the eggs are in the basket)