"This is not a trash can."

Translation: Ini bukan tempat sampah.

[IlseDens]

Again, why "sebuah" and what does that mean? It's in the mutiple choice though not above here.

[WayangOrang]

'sebuah' is a classifier/counter used for objects.

It's translated as the indefinite article 'a' or 'an'.

You can leave it out in this sentence.

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The three most frequently used classifiers are :

seorang ==> for humans
seekor ==> for animals
sebuah ==> for objects

More info here :

The Classifiers: Buah, Orang and Ekor
https://forum.duolingo.com/comment/3842014

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[Malindi22485]

thanks for sharing this. Makes it so much clearer

[jacksonbeale]

Cant use "Ini tidak tempat sampah"?

[WayangOrang]

No.

'tempat sampah' is a noun.

'bukan' is used to negate a noun.