Hi everyone! It wasn’t easy to put together a post about this. I’m listing below some of the most interesting approaches to this I’ve found.

1.Practical English Usage, brings on a farm as a special expression.

2.When farm is used as a noun, on is the preferred preposition.
Ex: …lived on a farm, …stayed on a farm

When farm is used as an adjective, in is the correct preposition.
Ex: …injuried in a farm accident,
…decorated in a farm theme

https://www.phrases.org.uk/bulletin_board/24/messages/589.html

3.Michael Jacobs says: Quem procura lógica e regras para as preposições em inglês estará provavelmente condenado a uma busca frustrante. Costumo dizer que, para mim, até as preposições em português são um mistério!… Por que tenho de dizer “dor de barriga” e não “dor na barriga”, “dor no dedo” e não “dor de dedo”, “dor de cabeça” e não “dor na cabeça”? Portanto, se esbarrar com um gringo reclamando de dores nos dentes… não é para se surpreender!

www.teclasap.com.br/preposicoes-in-a-field-x-on-a-farm/

4. Conventional farms consist mainly of open fields with some buildings. So talking about the people who occupy a farm the word on is more appropriate, however most of them will live in a farmhouse situated on the farm.

https://english.stackexchange.com/questions/129625/in-farms-or-on-farms

So after having had all this information, I conclude that on a farm is a special expression brought up by special people, because not many have had the chance to be raised on a farm! Thanks Afonso! I’ve enjoyed searching for that!

When we look at this image we can say:

The bird is on the top.   (parte superior, mais alta)

The dog is at the bottom.   (parte inferior)

And we can also say:

The bird is over the cat.   (sobre, por cima)

The dog is under the cat. (debaixo, embaixo)

These words have similar meanings and can sometimes be used as synonyms for each other.