Question 1

Why is it saco do supermercado instead of putting the words in the same order as "supermarket bag"?

Accepted Answer

In Portuguese, you cannot stack nouns together to describe something like you do in English. Instead, you have to use de (of) to link them. You literally say "the bag of the supermarket" (o saco do supermercado).

Question 2

Why use do here instead of just de?

Accepted Answer

do is a mandatory contraction of the preposition de (of/from) and the masculine article o (the). If you wanted to talk about a generic supermarket bag, you could say um saco de supermercado. But because we are talking about a specific bag from a specific supermarket, we include the "the" (o), making it do.

Question 3

Since a bag is usually only heavy temporarily when it is full of groceries, shouldn't the verb be está?

Accepted Answer

This is an excellent catch! If you are carrying a plastic bag and it feels heavy because of the groceries inside, you would indeed use está (from estar, for temporary states) and say O saco está pesado. Because this sentence uses é (from ser, for permanent characteristics), it implies the bag itself is a heavy object, perhaps a large, thick, heavy-duty reusable bag.

Question 4

If the sentence was about a box (a caixa) instead of a bag (o saco), what would change?

Accepted Answer

Two things would change to match the feminine noun caixa. The "the" at the start would become a, and the adjective at the end must also become feminine: A caixa do supermercado é pesada. Notice that do supermercado stays exactly the same, because the supermarket itself remains masculine.

O saco do supermercado é pesado.

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