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To brush up my English
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BlogWe say ON when we want to indicate the something is functioning, e.g.
The television is ON
We say OFF when we want to indicate the something is NOT functioning, e.g.
The lights are OFF
Generally speaking, ON is a preposition:
The book is ON tyhe table
And OFF is an adverb:
Take OFF your coat
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on,off If you are AT the theatre you are watching a play or some other performance.
If you are IN the theatre you are there for a different reason,perhaps you are working as a clearner or an electrician. Or maybe you are the manager!!
When we participate in the reason that a building, intstitution or establishment was created we usually say AT,
e.g AT home, AT the cinema
But if we want to indicate position only we say IN:
John is the house, the workers are IN the cinema
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at the theatre,in the theatre FOOD generally refers to any nourishment in solid form.
Rice, meat and fish are foods.
A MEAL refers to any of the customary occasions when we sit at a table, often with the family, and consume a certain amount of food, e.g. Breakfast, Lunch, Dinner
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food,meal 
