Questions & Answers about Ada karat pada bingkai replika yang lapuk itu.
Here ada is being used in its very common existential sense: there is / there are.
So:
- Ada karat ... = There is rust ...
It is not showing possession here. Indonesian often uses ada to introduce the existence or presence of something.
Compare:
- Ada karat pada bingkai itu. = There is rust on that frame.
- Saya ada buku. is not the normal way to say I have a book. For possession, Indonesian usually uses punya or just context.
Karat is a noun meaning rust.
So Ada karat ... literally means There is rust ...
By contrast, berkarat means rusty / rust-covered, and it acts more like a verb or adjective-like predicate:
- Ada karat pada bingkai itu. = There is rust on the frame.
- Bingkai itu berkarat. = The frame is rusty.
Both are natural, but they focus on slightly different things:
- ada karat focuses on the presence of rust
- berkarat focuses on the condition of the frame