Eu gosto de comer morangos com iogurte no café da manhã.

Because the verb gostar normally takes the preposition de before another verb or before a noun.

• gosto de comer = I like to eat
• gosto de morangos = I like strawberries

So de is required here. This is just how gostar works in Portuguese.

You can usually omit Eu.

Portuguese often drops subject pronouns when the verb form already makes the subject clear.

• Eu gosto de comer morangos...
• Gosto de comer morangos...

Both are correct. Including Eu can add emphasis, contrast, or clarity.

For example:

• Eu gosto de comer morangos, mas meu irmão não.
  = I like eating strawberries, but my brother doesn’t.

After gostar de, Portuguese normally uses the infinitive when talking about liking an action in general.

• gosto de comer = I like to eat / I like eating

Using comendo here would sound wrong in standard Portuguese.

So the pattern is:

• gostar de + infinitive

Examples:

• Gosto de estudar. = I like to study / studying.
• Ela gosta de viajar. = She likes to travel.

In Portuguese, when talking about something in a general sense, you can often use a bare plural noun without an article.

• comer morangos = to eat strawberries
• gosto de morangos = I like strawberries

If you say os morangos, it sounds more like specific strawberries, depending on context.

Compare:

• Gosto de morangos. = I like strawberries in general.
• Gosto dos morangos que você comprou. = I like the strawberries you bought.

Com means with.

So:

• morangos com iogurte = strawberries with yogurt

It shows that the strawberries are eaten together with yogurt.

This is the normal choice here. Using de would change the meaning and usually would not fit this sentence.

No is a contraction of:

• em + o = no

Here, no café da manhã literally means in the breakfast, but in natural English it is understood as for breakfast or at breakfast.

This kind of contraction is very common in Portuguese:

• em + o = no
• em + a = na
• em + os = nos
• em + as = nas

Examples:

• no almoço = at lunch / for lunch
• na escola = at school

Da is a contraction of:

• de + a = da

The expression café da manhã is the standard Portuguese phrase for breakfast.

Literally, it comes from something like morning coffee, but as a fixed expression it simply means breakfast.

So:

• café da manhã = breakfast
• da = of the / from the, depending on context

In this expression, it is best learned as one whole unit:

• tomar café da manhã = to have breakfast
• no café da manhã = at breakfast / for breakfast

Not exactly.

• no café da manhã = at breakfast / for breakfast
• de manhã = in the morning

So this sentence specifically means the person likes to eat strawberries with yogurt as breakfast / at breakfast time, not just at any point in the morning.

Compare:

• Eu gosto de comer morangos com iogurte no café da manhã.
  = I like to eat strawberries with yogurt for breakfast.

• Eu gosto de comer morangos com iogurte de manhã.
  = I like to eat strawberries with yogurt in the morning.

The second one is broader.

Yes, the word order is natural and very common.

The sentence is structured like this:

• Eu = I
• gosto de comer = like to eat
• morangos com iogurte = strawberries with yogurt
• no café da manhã = for breakfast / at breakfast

You can change the order a little for emphasis, but the original sounds very normal.

For example:

• No café da manhã, eu gosto de comer morangos com iogurte.

This puts extra focus on at breakfast.

Portuguese usually uses the plural here because it refers to actual strawberries as pieces of food.

• morangos = strawberries

Using the singular morango would usually suggest one strawberry, the flavor, or a different structure depending on context.

Examples:

• iogurte de morango = strawberry yogurt
• comer morangos = to eat strawberries

So in your sentence, morangos is the natural choice.

Yes.

In Portuguese, gostar de + infinitive can often match both:

• I like to eat
• I like eating

So:

• Eu gosto de comer morangos com iogurte no café da manhã.

can naturally correspond to either English version, depending on how you translate it.