A never-ending challenge for many

non-English speakers is to figure out when to

use in, on, at, or nothing at all (yes, that happens too).

If you know all the rules, then this Top Tip is not for you.

If, on the other hand, you would like to learn when to use

these prepositions correctly in time expressions

(or not use them, as I mentioned above),

then you should click on the pic to watch my explanation: