Cậu đổ rác vào thùng rác nhé.

Cậu is a very common Vietnamese pronoun for you, usually used with someone of a similar age, a friend, a younger person, or someone you are speaking to in a familiar way.

It is not a neutral you for every situation. Vietnamese pronouns depend a lot on relationship, age, and social context. So cậu sounds natural in casual, familiar speech, but it would not be the best choice for every person.

In this sentence, cậu is the subject: you.

The two rác words are doing different jobs:

• đổ rác = to dump/throw away trash
• thùng rác = trash can / garbage bin

So the first rác is the thing being handled: trash.
The second rác is part of a compound noun: thùng rác, literally something like trash container.

This kind of repetition is very normal in Vietnamese.

Thùng means a container, bin, barrel, or can, depending on context.
Thùng rác means trash can, garbage bin, or waste bin.

So:

• thùng = container/bin
• rác = trash
• thùng rác = trash bin

Vào means into or in(to) here. It shows movement toward the inside of something.

So:

• đổ rác vào thùng rác = put/throw the trash into the trash can

Without vào, the sentence would lose that clear idea of putting something inside the bin.

Nhé is a sentence-final particle that softens the sentence. It can make a request sound gentler, friendlier, or more like a reminder.

Here, nhé gives a sense like:

• okay?
• please
• all right?
• remember

So Cậu đổ rác vào thùng rác nhé. feels softer than just Cậu đổ rác vào thùng rác.

It is not translated word-for-word every time, but it is very important for tone.

It is most naturally understood as a gentle request or friendly instruction.

Because of nhé, it does not sound as hard or abrupt as a strict command. Depending on tone of voice, it can feel like:

• Please put the trash in the bin.
• Put the trash in the bin, okay?
• Make sure you put the trash in the bin.

So grammatically it looks simple, but socially it is softened.

The structure is:

• Cậu = subject
• đổ = verb
• rác = object
• vào thùng rác = prepositional phrase showing direction/place
• nhé = sentence-final particle

So the full pattern is:

Subject + Verb + Object + Direction/Location + Final particle

That is a very common Vietnamese sentence pattern.

It can be understood, but many learners should know that đổ rác often means to dump trash, to empty out trash, or even to take out the garbage, depending on context.

If you specifically mean put the trash into the trash can, many speakers would also commonly say:

• bỏ rác vào thùng rác nhé
• vứt rác vào thùng rác nhé

Very roughly:

• bỏ rác = put/throw away trash
• vứt rác = throw trash away
• đổ rác = dump out trash / empty trash

So this sentence is understandable, but a learner should know that bỏ rác vào thùng rác nhé may sound more natural in many everyday situations.

Yes. Vietnamese often drops the subject when it is already clear from context.

So you may also hear:

• Đổ rác vào thùng rác nhé.

That would still mean something like Put the trash in the bin, okay.

Including cậu makes the addressee more explicit. Leaving it out can sound more natural when the situation already makes it obvious who is being spoken to.

Yes. Depending on region and speaker, you may also hear:

• sọt rác
• thùng rác
• thùng đựng rác

All of these refer to a trash bin or garbage can, though the most common everyday choice depends on region and habit.

For a learner, thùng rác is a very safe and widely understood term.

Not necessarily rude, but definitely more direct.

Compare:

• Cậu đổ rác vào thùng rác nhé. = softer, friendlier
• Cậu đổ rác vào thùng rác. = more blunt, more like a plain instruction

Vietnamese often uses small particles like nhé, nhá, đi, với, and others to adjust tone. So even though they are small, they matter a lot for sounding natural and polite.

Vietnamese does not use articles like a, an, and the the way English does.

So thùng rác can mean:

• a trash can
• the trash can
• trash can(s)

The exact meaning depends on context.

In this sentence, English usually translates it as the trash can because the situation suggests a specific bin nearby, but Vietnamese does not need a separate word for the.