Hộp kia khá lớn.

Vietnamese often does not use a verb like English to be when a noun is described by an adjective.

So:

• Hộp kia khá lớn = That box is quite big
• literally, it is closer to Box that quite big

In Vietnamese, the adjective lớn can act as the predicate by itself. This is very common.

Compare:

• Cô ấy đẹp. = She is beautiful.
• Nhà này nhỏ. = This house is small.

You only use là in other situations, such as identifying or equating things:

• Đây là hộp. = This is a box.

But not:

• Hộp kia là lớn. ❌

Kia is a demonstrative, and here it means something like that or that over there.

So:

• hộp = box
• hộp kia = that box

A useful rough comparison is:

• này = this
• đó / ấy = that
• kia = that over there / that one yonder

In real usage, the differences can depend on distance, emphasis, and region, but for a learner, kia is often understood as a more clearly distant that.

In Vietnamese, demonstratives usually come after the noun, not before it as in English.

So English:

• that box

becomes Vietnamese:

• hộp kia

This is a very common word order pattern:

• nhà này = this house
• xe đó = that car
• người ấy = that person

So the structure is often:

• noun + demonstrative

not:

• demonstrative + noun

Khá means quite, fairly, or rather. It shows a moderate degree, not as strong as very.

So:

• khá lớn = quite big / fairly big

Compare:

• lớn = big
• khá lớn = quite big
• rất lớn = very big

So khá is weaker than rất.

Examples:

• Căn phòng khá rộng. = The room is quite spacious.
• Căn phòng rất rộng. = The room is very spacious.

Yes, absolutely. Cái hộp kia khá lớn is very natural.

Here, cái is a classifier often used with many everyday objects. So:

• hộp kia khá lớn
• cái hộp kia khá lớn

Both can work.

The version with cái may sound a bit fuller or more natural in some contexts, especially in everyday speech. Vietnamese often uses classifiers when talking about specific countable objects.

So you may hear:

• cái hộp này
• cái bàn kia
• cái ghế đó

But classifiers are not always required in every sentence, especially in shorter or simpler expressions.

No. Hộp is the actual noun meaning box.

In Vietnamese, classifiers are separate words such as:

• cái
• con
• quyển/cuốn
• chiếc

So in:

• cái hộp kia

cái is the classifier, and hộp is the noun.

That means:

• hộp kia = that box
• cái hộp kia = that box, with the classifier included

A rough pronunciation guide is:

• Hộp ≈ hope but with a short, clipped ending
• kia ≈ kee-uh / kee-a
• khá ≈ a breathy kha
• lớn ≈ something like lurn with a Vietnamese vowel and tone

The tones matter a lot:

• hộp has a heavy dropping tone
• kia has no marked tone, so it is level
• khá has a rising tone
• lớn has a creaky/rising broken tone in Northern pronunciation

If you are a beginner, the most important thing is to notice that Vietnamese is tonal, so changing the tone can change the word.

Because in this kind of sentence, Vietnamese often puts the descriptive adjective after the noun phrase.

So the structure is:

• Hộp kia = that box
• khá lớn = quite big

Together:

• Hộp kia khá lớn.

This is normal Vietnamese sentence order for describing something.

It can help to think of it as:

• [thing being talked about] + [description]

Other examples:

• Con mèo này rất nhỏ. = This cat is very small.
• Ngôi nhà đó đẹp. = That house is beautiful.

Yes. Lớn most commonly means big or large, but depending on context it can also relate to being grown-up, older, or major.

For example:

• nhà lớn = big house
• con lớn rồi = the child has grown up / is older now
• anh lớn = older brother / big brother, depending on context

But in Hộp kia khá lớn, the meaning is clearly physical size: That box is quite big.

Yes, you often can.

• Hộp kia khá lớn.
• Hộp đó khá lớn.

Both can mean That box is quite big.

The difference is subtle and depends on context, distance, and speaking style. Very roughly:

• này = this
• đó = that
• kia = that over there / that one farther away

In many everyday situations, đó and kia can both work, but kia often feels a bit more clearly distant.

Yes, it is natural and correct.

A speaker might also say:

• Cái hộp kia khá lớn.
• Hộp kia lớn lắm.
• Hộp đó khá to.

These are all natural variations.

One small note: in casual conversation, many speakers might choose to instead of lớn for physical size in some contexts:

• to = big, large
• lớn = big, large, sometimes with broader uses

But Hộp kia khá lớn is still perfectly normal and understandable.