Two tiny words. Là and thì. Both get translated as "is" in about half the phrasebooks out there, and that one bad habit follows learners around for years. Let's kill it today, over iced coffee, in ten minutes.
Here's a conversation I've heard a hundred times at a quán near Bến Thành:
Look at what she did. No là in front of đẹp. But a thì sitting right where an English speaker would never put anything. That's the whole lesson, and now we take it apart.
Quick answer: Là is an equals sign between two nouns (Tui là giáo viên), thì is a little pause meaning "as for…" (Cái đó thì mắc lắm) — and adjectives in Vietnamese already contain "is," so you never put là in front of one.
Là is an equals sign, not a verb
Forget "to be." Think =. You put a noun on the left, a noun on the right, and là in the middle. That's it. If both sides aren't nouns, là usually has no business being there.
Notice how every single right-hand side is a thing: a job, a person, a drink, a name. Nouns all the way down.
The rule that fixes half your mistakes: no là before an adjective
In Vietnamese, an adjective is basically already a little verb. Đẹp doesn't mean "beautiful," it means "is-beautiful." Mệt means "is-tired." So when you add là, you're saying "is is-tired," and it lands on Vietnamese ears about as smoothly as that sounds in English.
Common mistake
❌ Tui là mệt. · ❌ Cà phê này là ngon. · ❌ Bữa nay trời là nóng.
✅ Tui mệt quá. · ✅ Cà phê này ngon quá trời. · ✅ Bữa nay trời nóng dữ.
Just delete the là. Nothing needs to replace it.
Same thing when you make it negative. A noun sentence needs hông phải là; an adjective sentence just takes hông.
Good to know
Never say hông là for "is not." It's always hông phải là — literally "not correct that it equals." In fast Saigon speech people often drop the là and just say Cái đó hông phải xe của tui, "that's not my bike." Dropping it is fine; swapping it for hông là is not.
Thì: the little pause that means "as for…"
Now the fun one. Thì is not a verb and it is not "is." It's a topic marker — a speed bump you drop after whatever you're talking about, to say "okay, this thing here? about this thing…". English does it with intonation and a comma. Vietnamese does it with thì.
See how thì happily sits in front of an adjective (mắc), a verb (có), a whole phrase? It doesn't care what comes after. It only cares what comes before — the topic.
Thì is your contrast machine
The most natural use, the one that makes you sound local overnight: two thìs in a row, comparing two people or two things.
Local tip
Thì is almost always optional. Cái đó mắc lắm and Cái đó thì mắc lắm are both perfect Vietnamese. The version with thì adds a soft "well…" — it's the sound of someone giving you a considered opinion instead of a flat fact. Sprinkle it when you're comparing, hedging, or being a little diplomatic.
The other job of là: gluing sentences together
There's one more là you'll hear constantly, and it confuses people because it looks like it's breaking the rule. After verbs of thinking, hearing and saying, là works like English "that."
And the everyday combo vậy là — "so, that means…" — which you'll use ten times a day once you notice it:
Southern vs Northern packaging
Honestly, là and thì behave the same across the country — the grammar isn't the dialect difference. What changes is everything you wrap around them: the pronouns, the negative, the adjectives, the little end-particles.
| What you mean | Southern (Saigon) | Northern (Hanoi) |
|---|---|---|
| I'm a teacher | Tui là giáo viên | Tôi là giáo viên |
| That's not it | Hông phải vậy đâu | Không phải thế đâu |
| As for me, anything's fine | Tui thì sao cũng được | Tôi thì thế nào cũng được |
| That one's expensive | Cái đó thì mắc lắm | Cái đó thì đắt lắm |
| So that's done | Vậy là xong | Thế là xong |
| Oh really? | Vậy hả? | Thế à? |
Try it yourself
- Fix it: Cà phê này là ngon quá.
- Say "He's my older brother."
- Say "As for me, I'm not hungry yet."
- Fix it: Tui hông là người Việt.
- Contrast two things: "This shirt is cheap, that one's expensive."
Answers: 1. Cà phê này ngon quá — delete the là. 2. Ảnh là anh của tui (or Ảnh là anh tui). 3. Tui thì chưa đói. 4. Tui hông phải là người Việt. 5. Cái áo này thì rẻ, cái kia thì mắc.
Frequently asked questions
Is thì a second word for "is"?
No, and this is the single biggest trap. Thì never means "is." Delete it from an English sentence and the sentence still stands: Cái đó thì mắc = "that one, well, expensive." The "is" is baked into mắc.
Can là ever come before an adjective?
Only inside fixed patterns where là is pointing at a whole idea, not describing a noun — like Vậy là đúng rồi ("so that's right then") or Nói vậy là hông được nha ("saying that isn't okay"). As a beginner, treat "no là before adjectives" as absolute and you'll be right 99% of the time.
Can I use thì and là in the same sentence?
Sure, when you're contrasting two identities: Tui thì là giáo viên, còn ổng thì là bác sĩ. It's a bit heavy though — most Saigonese would just say Tui là giáo viên, còn ổng là bác sĩ.
What about the thì in "if… then"?
Same word, different hat — that one pairs with nếu to mean "then." Deep down it's the same idea (topic first, comment after), but it deserves its own lesson.
Do I sound rude if I drop thì everywhere?
Not at all. Dropping it is neutral. Adding it makes you sound thoughtful and a bit softer — which is why it's all over polite Saigon conversation about prices, opinions and other people's business.
What's the fastest way to drill this?
Say ten sentences out loud a day: five X là Y identity ones, five adjective ones with no là. Then get a native ear on them — this is exactly the kind of habit that a teacher fixes in one session. If you want to learn Southern Vietnamese online with someone who'll catch it the moment you slip, a 30-minute trial is plenty to reset the habit.
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