Cậu thích hải sản không?

Here, cậu means you.

It is an informal, friendly pronoun, often used:

• between friends
• between classmates
• with someone of a similar age
• sometimes with someone slightly younger

It is not the best all-purpose word for you in Vietnamese. Vietnamese pronouns depend a lot on age, relationship, and situation. In other contexts, you might need bạn, anh, chị, em, and so on.

Also, cậu can mean other things in other contexts, but in this sentence it is simply a pronoun.

No. Cậu sounds casual and personal.

Use it when the relationship is friendly and the age/social situation fits. If you are speaking to:

• a stranger
• someone older
• someone in a formal setting

then cậu may sound wrong or too familiar.

A safer neutral choice is often bạn:

• Bạn thích hải sản không?

If the other person is older, Vietnamese usually prefers kinship-style pronouns such as anh, chị, cô, chú, etc.

In this sentence, không is used to make a yes/no question.

A very common Vietnamese pattern is:

subject + verb + object + không?

So:

• Cậu thích hải sản. = a statement
• Cậu thích hải sản không? = a yes/no question

This is different from English, which often changes word order:

• You like seafood.
• Do you like seafood?

Vietnamese usually keeps the same basic word order and adds a question marker like không.

Not always. Không can do two related jobs:

1. Negation

   • Tôi không thích. = I do not like it.

2. Question marker in yes/no questions

   • Cậu thích hải sản không? = Do you like seafood?

So the exact role depends on where it appears in the sentence.

Because Vietnamese does not need an auxiliary verb like English do/does/did to form this kind of question.

English:

• Do you like seafood?

Vietnamese:

• Cậu thích hải sản không?

Vietnamese forms the question without adding a helper verb. That is a very common difference between English and Vietnamese grammar.

Hải sản means seafood.

It is a compound:

• hải = sea, ocean
• sản = products, produce

Together, hải sản refers to seafood in general, such as:

• fish
• shrimp
• crab
• squid
• shellfish

In everyday use, it usually means seafood as a category, not one specific item.

Usually no.

Vietnamese often does not use articles in the same way English does. So hải sản by itself can mean:

• seafood
• seafood in general
• some seafood, depending on context

That is why Cậu thích hải sản không? sounds complete and natural without anything before hải sản.

Yes. Cậu có thích hải sản không? is also natural.

Both are used:

• Cậu thích hải sản không?
• Cậu có thích hải sản không?

The version with có ... không is a very common yes/no question pattern in Vietnamese. The shorter version without có is also very common in everyday speech.

So as a learner, it is good to recognize both.

Yes, often you can, if the context already makes it clear who you are talking to.

For example:

• Thích hải sản không?

This is common in casual conversation. Vietnamese often drops subjects and pronouns when they are understood from context.

Still, including cậu is useful for learners because it makes the sentence structure clearer.

A few natural answers are:

Yes:

• Có.
• Ừ, thích.
• Có, mình thích.
• Có, tớ thích.

No:

• Không.
• Không thích.
• Không, mình không thích.
• Không, tớ không thích.

A useful detail: if someone addresses you as cậu, you would usually not answer using cậu for yourself. You might use tớ or mình, depending on the relationship and style.

Yes, mostly.

The structure is:

cậu + thích + hải sản + không

• subject
• verb
• object
• question marker

So Vietnamese keeps the basic statement order and adds không at the end to make it a yes/no question.

That is much simpler than English inversion patterns such as Do you like... ?

Thích means to like.

It usually means:

• to like
• to enjoy
• to be fond of

So in this sentence it is a normal, everyday verb.

Depending on context, thích can sometimes also mean liking someone in a more personal way, but here it clearly just means liking seafood.

It is not as strong as yêu, which usually means love.

Each Vietnamese word has a tone, and the tone is part of the word.

In this sentence:

• cậu has a heavy, low tone
• thích has a rising tone
• hải has a dipping/asking tone
• sản also has a dipping/asking tone
• không has a level tone

So even if your consonants and vowels are good, wrong tones can still make the sentence hard to understand.

For learners, it helps to practice the sentence slowly as separate tone units:

• cậu
• thích
• hải sản
• không?

Yes, in many situations bạn is a safer choice for learners.

• Cậu thích hải sản không? = friendly, informal, relationship-dependent
• Bạn thích hải sản không? = more neutral

That does not mean cậu is wrong. It just means Vietnamese pronouns are very social, and bạn is often easier to use until you get more comfortable with pronoun choices.

Yes, very natural.

It sounds like a normal conversational question, especially in a casual context. Native speakers might also say slightly different versions depending on region, tone of voice, and relationship, but this sentence itself is completely normal Vietnamese.