Nút bấm ở dưới bàn.

Nút bấm is a noun phrase meaning button, especially a push-button or something you press.

It is made of:

• nút = button, knob
• bấm = to press

Together, nút bấm often means a button that you press. In natural English, you would usually just say button unless you specifically want to emphasize that it is a push-button.

Vietnamese often leaves out the verb to be in sentences about location.

So:

• Nút bấm ở dưới bàn.

naturally means:

• The button is under the table/desk.

In English, you must say is, but in Vietnamese, the sentence can be complete without a separate word that works exactly like English is in this kind of structure.

Here, ở marks location. It is often used in sentences to mean something like at / in / located at.

So:

• ở dưới bàn = under the table / located under the table

You can think of ở as helping introduce where something is.

Both can be possible, but ở dưới bàn sounds fuller and clearer as a location phrase.

• dưới bàn = under the table
• ở dưới bàn = located under the table

In many everyday sentences, Vietnamese speakers include ở when stating where something is. Leaving it out may still be understood, but ở dưới bàn is a very normal way to express location.

Literally:

• dưới = below / under
• bàn = table or desk

So dưới bàn means under the table or under the desk.

Vietnamese does not require an article like the or a here, so English has to add that based on context.

It can mean either table or desk, depending on context.

For example:

• a dining table = bàn ăn
• a work desk/table = bàn làm việc

So Nút bấm ở dưới bàn could mean:

• The button is under the table
• The button is under the desk

The correct English choice depends on the situation.

Vietnamese often follows this basic pattern:

• thing
  • location

So:

• Nút bấm = the button
• ở dưới bàn = is under the table

This is actually fairly similar to English in overall meaning order, but Vietnamese does not need articles like the and does not always need a separate is.

A classifier is possible, but it is not always necessary.

• nút bấm = button
• cái nút bấm = the button / a button, with the general classifier cái

Using cái can make the noun phrase feel more concrete or more natural in some contexts, especially in speech. But leaving it out is also common, especially in short labels, instructions, or simple descriptive sentences.

So both of these can work:

• Nút bấm ở dưới bàn.
• Cái nút bấm ở dưới bàn.

It is written as two words, but it functions together as a single noun phrase.

This is very common in Vietnamese. A noun can be formed from two elements that work together as one unit in meaning. So although nút and bấm have their own meanings, nút bấm is understood as one item: button.

Not normally.

If you want to give the command Press the button under the table, Vietnamese would usually need a verb like bấm or nhấn as the main action of the sentence, for example:

• Bấm nút ở dưới bàn.
• Nhấn nút ở dưới bàn.

But Nút bấm ở dưới bàn is read as a noun phrase plus a location, so it is understood as The button is under the table/desk, not as a command.

The tones are important:

• nút — sắc tone
• bấm — sắc tone
• ở — hỏi tone
• dưới — ngã tone
• bàn — huyền tone

A learner may especially want to pay attention to:

• ở and dưới, because these can be harder to pronounce clearly
• the final consonants in nút and bấm

Good pronunciation helps avoid confusion, since Vietnamese depends heavily on tone and final sounds.

Yes, it is natural and understandable.

It is a short, straightforward sentence meaning that the button is located under the table or desk. In real conversation, a speaker might also say:

• Cái nút bấm ở dưới bàn.
• Nút bấm nằm dưới bàn.

But Nút bấm ở dưới bàn is perfectly normal Vietnamese.