No supermercado, eu pego um carrinho e levo uma sacola grande.

Because no is a contraction of em + o:

• em = in, at, on
• o = the

So:

• em o supermercado → no supermercado

This is very common in Portuguese. Similar forms are:

• na = em + a
• nos = em + os
• nas = em + as

Examples:

• na escola = at school
• no carro = in the car

In this sentence, no supermercado sets the location: at/in the supermarket.

The phrase No supermercado comes first as a location expression, and the comma helps separate that introductory element from the main clause:

• No supermercado, eu pego um carrinho...

It is similar to English sentences like:

• At the supermarket, I get a cart...

In short, the comma is natural because the sentence begins with a setting or context phrase.

Yes, eu can be omitted in Portuguese because the verb form often already shows the subject.

• eu pego
• pego

Both can mean I take/get.

Portuguese often drops subject pronouns when the meaning is clear. However, eu may be included for:

• emphasis
• clarity
• contrast

So these are both natural:

• No supermercado, eu pego um carrinho...
• No supermercado, pego um carrinho...

Pego is the first-person singular present tense of pegar:

• eu pego = I take / I get / I grab

Conjugation in the present:

• eu pego
• você/ele/ela pega
• nós pegamos
• vocês/eles/elas pegam

In this sentence, pego means something like I get or I take a shopping cart.

In everyday Brazilian Portuguese, pegar is extremely common and natural for physically taking or getting something.

So:

• pegar um carrinho = get/take a cart

Other verbs may be possible in other contexts, but they would often sound less natural here:

• tomar usually means things like to take medicine, a shower, a decision, etc.
• obter means to obtain, but sounds much more formal

For casual daily actions, pegar is the normal choice.

Carrinho is the diminutive form of carro, but in this context it means a shopping cart or shopping trolley.

The ending -inho often adds the idea of:

• small size
• affection
• informality

So literally carrinho is something like little cart, but in supermarkets it is simply the normal word for a shopping cart.

Depending on the store, Brazilians may also say:

• carrinho de compras = shopping cart

But just carrinho is very common and natural.

Levo is the first-person singular present tense of levar:

• eu levo = I carry / I take / I bring

In this sentence, levo uma sacola grande means something like I carry/take a big bag.

Conjugation in the present:

• eu levo
• você/ele/ela leva
• nós levamos
• vocês/eles/elas levam

They express two different actions:

• pego um carrinho = I get/take a cart
• levo uma sacola grande = I carry/take a big bag along

A useful way to think about it:

• pegar = to pick up, take, get
• levar = to carry, take along, bring with you

So first the speaker gets a cart, then carries or brings a large bag.

In Portuguese, adjectives usually come after the noun:

• uma sacola grande = a big bag

That is the normal, neutral word order.

Sometimes adjectives can come before the noun, but that often sounds more literary, emphatic, or changes the nuance. For everyday speech, sacola grande is the standard choice.

Sacola usually means a shopping bag or a bag for carrying purchases.

It is not exactly the same as:

• bolsa = handbag, purse, bag
• saco = sack, bag, or sometimes just a generic bag depending on context

In a supermarket context, sacola strongly suggests a shopping bag, so it fits very naturally here.

Portuguese uses articles very often, more often than English in some contexts.

Here:

• um carrinho = a cart
• uma sacola grande = a big bag

The articles match the gender of the nouns:

• carrinho is masculine → um
• sacola is feminine → uma

Using the indefinite articles here sounds natural because the speaker is talking about non-specific items.

You usually learn noun gender together with the noun:

• o carrinho
• a sacola

That is why it is best to memorize nouns with their article.

There are some patterns:

• nouns ending in -o are often masculine
• nouns ending in -a are often feminine

So:

• carrinho → masculine
• sacola → feminine

But there are exceptions in Portuguese, so the article is important.

It can be either, depending on context.

The present tense in Portuguese often covers:

1. habitual action

   • No supermercado, eu pego um carrinho...
   • At the supermarket, I usually get a cart...

2. narration or immediate description

   • At the supermarket, I get a cart and carry a big bag.

Without more context, many learners would understand it as a general routine or typical action.

If you want to make the habitual meaning clearer, you could say:

• Quando vou ao supermercado, pego um carrinho...
• Sempre pego um carrinho...

Yes, in context it can feel like and or and then.

• eu pego um carrinho e levo uma sacola grande

The conjunction e literally means and, but when two actions happen in sequence, English may naturally translate it as and then.

Portuguese does not need a special word here; e works fine.

Yes, it is grammatically natural. A Brazilian speaker would understand it easily.

That said, depending on the exact situation, some speakers might choose slightly different wording, for example:

• No supermercado, pego um carrinho e uma sacola grande.
• No supermercado, pego um carrinho e levo uma bolsa grande.
• Quando vou ao supermercado, pego um carrinho...

But the original sentence is completely acceptable and clear.

A simple approximate pronunciation for English speakers is:

• pego ≈ PEH-goo
• levo ≈ LEH-voo

A few helpful notes:

• e in these words is usually an open or mid eh sound in Brazilian Portuguese
• the final -o in unstressed position often sounds like u to English ears

So pego may sound a bit like PEH-gu and levo like LEH-vu.

Exact pronunciation varies by region, but that approximation is useful for learners.