Completed Action 'Dai'
Grammar Rule in 30 Seconds
Use 'dai' (ได้) to express ability ('can') or to indicate that an action has been successfully completed.
- Ability: Subject + dai + Verb (e.g., 'phom dai pai' - I can go).
- Completed Action: Verb + dai (e.g., 'kin khao dai' - I have eaten).
- Negation: Place 'mai' before 'dai' (e.g., 'mai dai pai' - did not go).
Meanings
A versatile auxiliary verb used to denote ability (can) or the successful completion of an action in the past.
Ability
Expressing the capability to perform an action.
“เขาพูดภาษาไทยได้”
“ฉันว่ายน้ำได้”
Completed Action
Indicating an action was successfully performed or occurred in the past.
“ฉันทำการบ้านได้แล้ว”
“เขาไปเที่ยวได้สำเร็จ”
Permission
Asking or giving permission.
“จอดรถที่นี่ได้”
“เข้าได้ไหม”
Dai Usage Patterns
| Type | Structure | Example | Meaning |
|---|---|---|---|
| Ability | Subject + dai + Verb | Phom dai pai | I can go |
| Completion | Subject + Verb + dai | Phom pai dai | I went / I have gone |
| Negative | Subject + mai dai + Verb | Phom mai dai pai | I cannot go |
| Question | Subject + Verb + dai + mai | Pai dai mai | Can you go? |
| Past Negative | Subject + mai dai + Verb | Phom mai dai pai | I did not go |
| Permission | Verb + dai | Jod dai | Can park |
Reference Table
| Form | Structure | Example |
|---|---|---|
| Affirmative Ability | S + dai + V | Chan kin dai |
| Affirmative Completion | S + V + dai | Chan kin dai laew |
| Negative Ability | S + mai dai + V | Chan mai dai kin |
| Negative Completion | S + V + mai dai | Chan kin mai dai |
| Question | S + V + dai + mai | Kin dai mai? |
| Short Answer | dai / mai dai | dai |
Espectro de formalidad
ข้าพเจ้าสามารถไปได้ (General)
ฉันไปได้ (General)
ไปได้ (General)
ไปดิ (General)
The Dual Nature of Dai
Before Verb
- Ability Can
After Verb
- Completion Did/Done
Examples by Level
ฉันไปได้
I can go.
กินได้ไหม
Can I eat?
ทำได้
I can do it.
ไปได้ไหม
Can you go?
ฉันทำการบ้านได้แล้ว
I have finished my homework.
เขาไม่ได้มา
He did not come.
คุณซื้อของได้ไหม
Were you able to buy the items?
จอดรถที่นี่ได้
You can park here.
ถ้าคุณพยายาม คุณทำได้แน่นอน
If you try, you can definitely do it.
ฉันไม่ได้ตั้งใจทำ
I didn't do it on purpose.
เขาบอกว่าเขาไปไม่ได้
He said he cannot go.
เราตกลงกันได้แล้ว
We have reached an agreement.
การที่เขามาได้ถือเป็นเรื่องดี
The fact that he could come is a good thing.
ไม่ว่าอย่างไร ฉันก็ทำไม่ได้
No matter what, I cannot do it.
เขาได้รับการยอมรับ
He was accepted (received acceptance).
คุณไม่ควรทำแบบนั้นได้
You shouldn't be able to do that.
หากปราศจากความช่วยเหลือ เขาคงทำไม่ได้
Without help, he wouldn't have been able to do it.
เขาได้แสดงความเห็นไว้ว่า...
He expressed his opinion that...
การตัดสินใจครั้งนี้ทำได้ยาก
This decision was difficult to make.
เขาได้บรรลุเป้าหมายแล้ว
He has achieved his goal.
หาได้ยากที่จะพบคนเช่นเขา
It is rare to find someone like him.
มิอาจทำได้โดยง่าย
It cannot be done easily.
เขาได้แต่เฝ้ามอง
He could only watch.
สิ่งที่เขาได้ทำไปนั้นมีค่ามาก
What he did was very valuable.
Easily Confused
Both mean 'can'.
Both indicate past.
Both mean success.
Errores comunes
dai kin
kin dai
mai kin dai
mai dai kin
dai pai
pai dai
kin dai mai
kin dai mai
dai laew kin
kin dai laew
mai dai pai laew
mai dai pai
dai pai mai
pai dai mai
dai pen
dai
dai samret
samret
dai pai
pai dai
dai dai
dai
mai dai dai
mai dai
dai laew
dai
Sentence Patterns
ฉัน ___ ได้
คุณ ___ ได้ไหม
เขา ___ ได้แล้ว
ถ้า ___ ได้ ฉันจะไป
Real World Usage
ไปได้ป่ะ?
สั่งได้ไหม?
ผมทำได้ครับ
ไปที่นี่ได้ไหม?
ทำได้จริง!
ตกลงได้
Check the position
Don't confuse with 'pen'
Use with 'laew'
Politeness
Smart Tips
Put 'dai' before the verb.
Put 'dai' after the verb.
Use 'mai dai' for everything negative.
Always end with 'mai'.
Pronunciación
Tone
Dai has a falling tone.
Question
Pai dai mai? ↑
Rising intonation at the end.
Memorize It
Mnemonic
Dai is a 'D' word: Do (completed) and Dare (can/ability).
Visual Association
Imagine a door. If you stand BEFORE the door, you have the potential to open it (Ability). If you stand AFTER the door, you have already walked through it (Completion).
Rhyme
Dai before is 'can', Dai after is 'ran' (completed).
Story
Somchai wanted to climb a mountain. He said 'Phom pai dai' (I can go). He climbed it. Now he says 'Phom pai dai laew' (I have gone/finished).
Word Web
Desafío
Write 3 sentences about what you can do today and 3 about what you finished yesterday.
Notas culturales
Thais use 'dai' to be polite. Adding 'dai' to a request makes it softer.
Derived from the Tai root meaning 'to obtain' or 'to get'.
Conversation Starters
วันนี้คุณไปไหนได้บ้าง?
คุณทำการบ้านเสร็จหรือยัง?
คุณพูดภาษาไทยได้ไหม?
คุณคิดว่าเราทำโครงการนี้ได้สำเร็จไหม?
Journal Prompts
Test Yourself
ฉัน ___ ไป (I can go)
Which is correct?
Find and fix the mistake:
dai kin (I ate)
dai / phom / pai
Match each item on the left with its pair on the right:
'Dai' changes for person.
A: ไปได้ไหม? B: ___
I cannot go.
Score: /8
Ejercicios de practica
8 exercisesฉัน ___ ไป (I can go)
Which is correct?
Find and fix the mistake:
dai kin (I ate)
dai / phom / pai
Match 'dai' position.
'Dai' changes for person.
A: ไปได้ไหม? B: ___
I cannot go.
Score: /8
Preguntas frecuentes (8)
No, Thai verbs and auxiliaries do not conjugate for person.
Yes, context usually implies the tense.
Dai is situational; Pen is for learned skills.
It is neutral and used in all registers.
Use 'mai' before it.
Avoid it; it sounds repetitive.
Yes, it is standard in all written Thai.
It is the primary way to express ability and completion.
In Other Languages
poder
Thai word order changes based on completion.
pouvoir
French conjugates for person.
können
German has complex conjugation.
dekiru
Japanese is SOV.
de
Chinese uses it as a complement.
istata'a
Arabic is highly inflected.
