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Hi there,
From your question, I can only suggest one logical solution: positive (affirmative) and negative sentences. Probably your students are not used to negative structures, thus they automatically avoid creating such sentences in their minds. I cannot see what your students' native language(s) is/are, but what I can tell from my personal experience is that some people tend to use affirmative and others negative sentences. This might also be a cultural feature, which could then explain their choice of an affirmative structure.
Hope this helps!
Regards, Filip
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