Analyzing sentences

0Hi,02br
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00Please help me analyzing these sentences. SOme are partially written.02br
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00... having some01u00 high-beginners02u00 in the same class as some more01u00 intermediate-level02u00 ... usually about two-thirds of each class is not at such a high level.02br
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001. Here 'high-beginner' is hyphenaterd, but as (I think) you know that 'high' is an adjective and leaves a little doubt as to why you need to hyphenate in front of the noun 'beginners'.02br
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002. Are 'intermediate' and 'level' hyphenated bacause it is acting as an adjecitve and not as a noun eventhough what comes after 'as' could be a noun or an adjective? 02br
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00In smaller language classes, this can be a time of individual sharing and attention between 01u00teacher and student.02u02br
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003. Here, are the words 'teacher' and 'student' acting as roles and/or roles that can be assumed by only one person at a time?02br
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01i00As lecturers in a university, we are fortunate ...02i02br
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01i00They need to bring a pen in case they need to write.02i02br
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004. Here, would you say the part 'lecturers in a university' is valid in terms of it being able to accommodate the plural 'we'? I think the second sentence can accommodate the 'they' quite comfortably. 0-