Cá này khá ngon.

• cá = fish
• này = this
• khá = quite, fairly, pretty
• ngon = delicious, tasty

So the structure is literally something like fish this quite tasty.

Vietnamese often leaves out the verb to be when talking about qualities.

So instead of saying This fish is quite tasty, Vietnamese simply says:

Cá này khá ngon
Literally: This fish quite tasty

This is very normal in Vietnamese.

In Vietnamese, demonstratives like này (this) usually come after the noun.

So:

• cá này = this fish
• nhà này = this house
• người này = this person

This is the normal word order in Vietnamese, even though it feels reversed compared with English.

khá means quite, fairly, or pretty. It gives a moderate positive meaning.

So khá ngon means:

• quite tasty
• fairly delicious
• pretty good

It is usually less strong than rất ngon (very delicious).

A rough scale could be:

• hơi ngon = a little tasty / somewhat good
• khá ngon = quite tasty
• rất ngon = very tasty

Because in Vietnamese, adjectives often come after the noun phrase they describe, especially in sentences like this.

So:

• cá này ngon = this fish is tasty
• món này ngon = this dish is tasty

The pattern is basically:

noun + demonstrative + degree word + adjective

Here:

• cá này = this fish
• khá ngon = quite tasty

Not necessarily.

Vietnamese often uses classifiers, and for animals you may hear con, so con cá này is possible. But cá này is also very natural, especially when talking about fish as food or about fish in a general way.

A simple way to think about it:

• cá này = this fish / this fish dish
• con cá này = this particular fish, especially as an animal or individual creature

In everyday speech, leaving the classifier out here is completely normal.

It can mean either, depending on context. But because the sentence says khá ngon (quite tasty), people will naturally understand it as fish to eat.

So in this sentence, cá is most likely referring to fish as food, not a live fish swimming around.

A rough guide:

• cá — rising tone
• này — low/falling tone
• khá — rising tone
• ngon — level-ish tone in the North

If you are a beginner, it may help to say it in chunks:

cá này / khá ngon

A very rough English-style approximation is: gah nye khah ngon

But the tones matter a lot, so listening to native audio is important.

Yes, it is natural.

It sounds like a normal comment about food:

• Cá này khá ngon. = This fish is quite tasty.

Depending on tone and context, it may sound slightly neutral or mildly positive rather than very enthusiastic.

If you want stronger praise, you could say:

• Cá này ngon lắm. = This fish is very delicious.
• Cá này rất ngon. = This fish is very tasty.

So khá ngon sounds a bit more moderate.

No, that would not sound natural.

The normal order is: cá này khá ngon

Vietnamese does not usually put này before the noun the way English puts this before fish.

So remember:

• correct: cá này
• not natural: này cá

Yes. ngon is often translated as delicious, but in everyday Vietnamese it can also mean tasty or good to eat.

So khá ngon does not always mean extremely delicious. It can simply mean:

• pretty tasty
• quite good
• fairly nice

That is why This fish is pretty tasty is often a very natural translation.