@Jmat

thank you, very detailed information

Prepositions are very unpredictable when talking about concepts, and you will need to memorise when to use them. This is because  'in', 'at' and 'on' really describe physical positions, so they can be a bit weird when they're used with abstract concepts.

When it comes to physical position, it's usually very simple to tell which one to use.

 -'At' is just a general word describe something's location.

-'In' is used to describe when something is inside a 2D or 3D space. When talking about physical position, it can usually be replaced with 'inside'. It's the opposite of 'outside'.

-Something is on something else when it is touching the outside surface (usually the top) of it.

Ex.

Grass grows on the ground.

Ants live in the ground.

Clocks hang on walls.

Termites live in walls.

To be on a planet is to be standing on it.

To be in a planet is to be deep underground.

People sit in cars.

Birds sit on cars.

It's much natural to say 'in' or 'on', when they apply instead of 'at'.

Hey Becky, prepositions are very hard. They even differ between closely related languages like English, Dutch and German. The only thing you can do, is to memorize them all, and read and listen a lot so you will get 'a feeling' for what is right.

Let me give you an example on how strong prepositions differ:

English: I am in love with you.

Dutch: I ben verliefd op jou. (But 'op' in Dutch, is actually mostly 'above' or 'on' )

German: Ich habe mich in dir verliebt. (And 'in' in German, is just 'in' in English.)

You should just add English to the languages you know. You don't have to mark them as languages you are presently learning..., I think.

Anyway, it's a common mistake. I have been here longer, and lately I also popped a question in the English board for German. You cannot repair it unfortunately.

@ Jacky,,yeah,,,,actually I am learning English and Spanish is only the second. but I dont why, I cant choose English as the language of this topic