Questions & Answers about zāngyīfu zài zhèlǐ.
Because 在 is the key word for location here.
In Mandarin, to say that something is located somewhere, you usually use:
- A 在 B = A is at/in B
So:
- 脏衣服在这里。 = The dirty clothes are here.
是 is usually used to connect two nouns, as in:
- 他是老师。 = He is a teacher.
You normally do not use 是 just to say where something is.
Here, 在 expresses location: to be at / to be in.
A simple way to understand the sentence is:
- 脏衣服 = the dirty clothes
- 在 = are located
- 这里 = here
So the structure is:
- Subject + 在 + place
In more advanced grammar, 在 can sometimes be described differently depending on the sentence, but in this sentence it is easiest to treat it as the main location word: are here / are at this place.