sunny123 I think it is natural and correct if a teacher at the begining of his class to say ..... "Hi class" It depends on the formality required by the school administration. That is fine but casual.
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sunny123 I think it is natural and correct if a teacher at the begining of his class to say ..... "Hi class"It depends on the formality required by the school administration. That is fine but casual.
sunny123Is it also correct if the teacher says .... 1. Hi childrenIf they are very young elementary grades, yes.
sunny1231. Hi class 2. Hi children 3. Hi studentsMr M has already told you about these.
sunny1233. Hi students 4. Hi studentsThere may be an infinitesimal difference, but I can't see it.