Hi Mariyka, In this sense 'at' or 'in' don't really matter and both are used, but if you want to say where one is at the moment, you would say: He is at school. (He could be either in the building or outside the school) He is in school. (He is in the building of the school) He teaches at a school.
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AnonymousThanks for your precise elaboration. But i have a difficulty in the meaning of sentence. i.e"He teaches at SIEL". and"He is teaching at SIEL".Now plz explain me what is the main difference between these two from the meaning point of view.Thanks in AdvanceThere is no difference in meaning.