The word at informs where you currently are. Difference between at and in is that at refers to a more general location. Perkataan at memberitahu di mana anda berada. Perbezaan at dan in ialah ianya memberitahu tempat yg umum.
I am at the museum. Saya di museum.
Ai em at der muzium.
I am at the dentist. Saya di klinik gigi.
Ai em ...
You also can use at to tell a specific time. Anda juga boleh gunakan at untuk memberitahu masa yang tertentu.
We are coming back at 5. Kami akan balik pukul 5.
Wi r kaming bek at faiv.
He will be here at 10. Dia akan berada di sini pukul 10.