Eu gosto de comer uvas no café da manhã.

In Portuguese, the verb gostar normally requires the preposition de before the thing you like.

• gosto de uvas = I like grapes
• gosto de comer uvas = I like eating grapes

So de is part of the grammar of gostar. English does not need this preposition in the same way, but Portuguese does.

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

• Eu gosto de comer uvas no café da manhã.
• Gosto de comer uvas no café da manhã.

Both are natural. Including eu can add emphasis, clarity, or contrast, such as I like eating grapes, but someone else may not.

After gostar de, Portuguese often uses an infinitive verb to express liking an activity.

• gosto de comer = I like to eat / I like eating
• gosto de nadar = I like to swim / I like swimming

So comer stays in its base form because it is functioning as the action that the speaker likes.

Both can be possible, but they are used a little differently.

• comer uvas = to eat grapes, grapes in general
• comer as uvas = to eat the grapes, a specific set of grapes

In your sentence, uvas sounds general, so it means grapes as a type of food, not particular grapes already identified in the conversation.

No is a contraction of:

• em
  • o = no

So:

• no café da manhã literally means in the breakfast
• in natural English, this is usually translated as for breakfast or at breakfast

This kind of contraction is very common in Portuguese.

Café da manhã is the normal Portuguese expression for breakfast.

Literally, it looks like:

• café = coffee
• da = de + a
• manhã = morning

But as a whole, café da manhã means breakfast. You should learn it as a fixed expression.

Da is a contraction of:

• de
  • a = da

So café da manhã literally has the structure coffee of the morning, but you should think of it simply as the standard phrase for breakfast.

Yes, you can, and it sounds natural. It means something like:

• I like grapes for breakfast
• I like having grapes at breakfast

Adding comer makes the action more explicit:

• gosto de comer uvas = I like eating grapes

Without comer, the sentence is slightly more compact, but the meaning is still clear.

A natural approximate pronunciation is:

EH-oo GOS-too dji ko-MEHR OO-vahs noo ka-FEH da ma-NYAH

A few notes:

• gosto: the first o is usually more open than in English
• de often sounds like dji in many Brazilian accents before certain sounds, though here it may also sound closer to dee
• r at the end of comer is often softer than an English r
• uvas starts with a vowel sound: OO-vahs
• manhã has a nasal ending; the nh sounds like ny in canyon

Pronunciation varies by region, but this will help you sound close to standard Brazilian Portuguese.

After em, Portuguese often uses the article if the expression normally takes one, which is why you get no here.

But inside the expression café da manhã, the phrase itself is fixed. You do not say café da a manhã or anything like that. The da is already part of the expression.

So:

• no café da manhã = at breakfast / for breakfast

You should treat café da manhã as one vocabulary unit.

Yes. In context, it can often be translated either way.

• for breakfast focuses more on the meal as a choice of food
• at breakfast focuses more on the time or occasion

Portuguese uses no café da manhã for both ideas in many situations, so the best English translation depends on context.

It is neutral and completely natural in everyday Brazilian Portuguese. It is not especially formal or especially casual.

You could say it:

• in conversation
• in writing
• in class
• when talking about your habits

It is a very standard sentence.

Yes, a little. Portuguese allows some flexibility, although the original order is the most neutral.

For example:

• Eu gosto de comer uvas no café da manhã.
• No café da manhã, eu gosto de comer uvas.

The second version emphasizes at breakfast / for breakfast a bit more. The original version is the most straightforward and common.

You put não before the verb:

• Eu não gosto de comer uvas no café da manhã.

This means I do not like eating grapes for breakfast.

If you omit eu, that also works:

• Não gosto de comer uvas no café da manhã.

In spoken Brazilian Portuguese, you can often make it a question just by using intonation:

• Você gosta de comer uvas no café da manhã?

You can also ask about yourself rhetorically, though that is less common:

• Eu gosto de comer uvas no café da manhã?

Usually, to ask someone else, you would change the subject:

• Você gosta de comer uvas no café da manhã? = Do you like eating grapes for breakfast?

Gosto expresses a general preference or habit:

• Eu gosto de comer uvas no café da manhã. = I like eating grapes for breakfast.

Estou gostando usually means I am enjoying in a more immediate or temporary sense, often about something happening now.

So for a general statement about what you like, gosto is the correct choice.