what is wrong with "trees are not growing here". The sentence in Ukrainian is "here are not grow (present tense) trees". There is actually a difference between the two English sentences. The one in the answer key means that it is not possible for trees to grow here, the one I used means that it is possible to grow there but currently are not. The answer key sentence could be said of a place where the soil is contaminated but not of a field full of beets.