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1.Please give your general guide on how to use "on", "in" and "at".
2.The ducks/swans are swimming in/on the water. I have seen both of these versions used. Which is correct please?
3. strictly use "at school". = can i use "in school"cos it's in the building.
4. at the playground = "at" is strictly prohibited? Always in?
2.The ducks/swans are swimming in/on the water. I have seen both of these versions used. Which is correct please? Both could be used. They are equally valid for ducks.
3. strictly use "at school". = can I use "in school" because it's in the building. If you do use it in this sense, then "in the school" is better.
4. at the playground = "at" is strictly prohibited? Always in? If referring to activities/presence within the playground, yes. "At" could be used to say something like "I will meet you at the playground".
Prepositions 
Linear Mode
