English compresses skill, permission, opportunity, physical capacity, and successful performance into can. Thai makes speakers choose a viewpoint. Postverbal ได้ presents an event as possible or successfully available, postverbal เป็น commonly presents learned know-how, สามารถ presents general capacity in a more formal frame, and postverbal ไหว asks whether the participant can manage the demand.
These are productive constructions, not four interchangeable translations. There is overlap—someone who ว่ายน้ำเป็น will often ว่ายน้ำได้ too—but each sentence profiles a different reason for saying the event is possible.
A four-way map
| Viewpoint | Productive frame | Natural interpretation |
|---|---|---|
| practical possibility, permission, or success | verb phrase + ได้ | the event can happen or be achieved |
| learned know-how | activity + เป็น | the participant knows how |
| general or stated capacity | สามารถ + verb phrase (+ ได้) | the participant/system is capable |
| capacity to cope with a demand | verb phrase + ไหว | the load is manageable |
ผมพูดภาษาไทยได้นิดหน่อยครับ
phom phut phasa thai dai nit noi khrap
I can speak a little Thai. (ordinary polite speech, male speaker; practical ability)
น้องว่ายน้ำเป็นแล้วค่ะ
nong wai nam pen laeo kha
My younger sibling knows how to swim now. (ordinary polite speech, female speaker; learned skill)
ระบบนี้สามารถส่งไฟล์ขนาดใหญ่ได้ครับ
rabop ni samat song fai khanat yai dai khrap
This system can send large files. (formal-polite technical explanation, male speaker)
วันนี้ฉันเดินต่อไม่ไหวแล้วค่ะ
wan ni chan doen to mai wai laeo kha
I can't walk any farther today. (ordinary polite speech, female speaker; present physical limit)
Postverbal ได้: the event is available
In the ability construction, ได้ follows the verb phrase. The accessible reading depends on the event and context: เข้าได้ may mean entry is permitted or physically possible; ซ่อมได้ may mean repair is possible or the person is able to do it. Thai does not force these meanings into separate verb forms.
พรุ่งนี้ผมมาประชุมได้ครับ
phrung ni phom ma prachum dai khrap
I can come to the meeting tomorrow. (ordinary polite speech, male speaker; schedule permits it)
ประตูด้านข้างเปิดได้ค่ะ
pratu dan khang poet dai kha
The side door can be opened. (ordinary polite speech, female speaker; practical possibility)
ตรงนี้จอดรถได้ไหมคะ
trong ni chot rot dai mai kha
Can I park here? (ordinary polite question, female speaker; asking permission)
Postverbal ได้ scopes over the preceding event. Its other positions and lexical “get/receive” use are treated on ได้ as acquisition and grammatical marker.
Postverbal เป็น: learned know-how
After compatible activities, เป็น says that a person has acquired the know-how: ว่ายน้ำเป็น, ขับรถเป็น, ทำอาหารเป็น. This is not identity เป็น and not an English infinitive. The order is activity first, เป็น second.
คุณขับรถเป็นไหมครับ
khun khap rot pen mai khrap
Do you know how to drive? (ordinary polite question, male speaker)
เมื่อก่อนฉันทำอาหารไม่เป็น แต่ตอนนี้ทำเป็นแล้วค่ะ
muea kon chan tham ahan mai pen tae ton ni tham pen laeo kha
I didn't know how to cook before, but now I do. (ordinary polite speech, female speaker; repeated object omitted)
เป็น is construction-sensitive, not a universal label for every acquired capacity. For achievement under present conditions, use ได้; for knowledge of a familiar activity, เป็น is especially natural. ฉันขับรถเป็น says “I know how to drive,” while วันนี้ฉันขับรถไม่ได้ can say that driving is impossible today despite that skill.
สามารถ: explicit, general capacity
สามารถ + verb phrase is common in policies, instructions, formal service language, technical descriptions, and careful statements of capability. Clause-final ได้ often appears as well: สามารถเปลี่ยนสินค้าได้. Everyday conversation frequently prefers the shorter postverbal ได้ construction.
ลูกค้าสามารถเปลี่ยนสินค้าได้ภายในสิบสี่วันค่ะ
luk kha samat plian sinkha dai phainai sip si wan kha
Customers can exchange merchandise within fourteen days. (formal service policy, female voice)
เครื่องนี้สามารถพิมพ์เอกสารสองหน้าได้ครับ
khrueang ni samat phim ekkasan song na dai khrap
This machine can print double-sided documents. (formal-polite technical explanation, male speaker)
In ordinary conversation, ร้านนี้เปลี่ยนสินค้าได้ is lighter than ร้านนี้สามารถเปลี่ยนสินค้าได้, though both are grammatical. Register is part of choosing a construction; Thai is not switching to a separate formal grammar.
ไหว: enough capacity for this demand
ไหว measures coping capacity against a load: weight, distance, workload, pain, time pressure, food, or emotional strain. It is very common in ordinary conversation. The question ไหวไหม asks “Can you manage?” rather than “Do you know how?”
โต๊ะตัวนี้หนักมาก คุณยกไหวไหมคะ
to tua ni nak mak khun yok wai mai kha
This table is very heavy. Can you lift it? (ordinary polite question, female speaker)
งานเยอะขนาดนี้ ผมทำคนเดียวไม่ไหวครับ
ngan yoe khanat ni phom tham khon diao mai wai khrap
With this much work, I can't manage it alone. (ordinary polite speech, male speaker)
พักก่อนก็ได้ค่ะ ถ้าเดินต่อไม่ไหว
phak kon ko dai kha tha doen to mai wai
We can take a break if you can't keep walking. (ordinary polite speech, female speaker)
The last example combines two ability constructions: พัก...ได้ presents an available option, while เดินต่อไม่ไหว presents a limit. Adjacent predicates do not behave like English conjugated verb plus infinitive.
Negation and the crucial order contrast
Each construction has its own negation placement:
- verb phrase + ไม่ได้: the event is not possible/permitted or cannot succeed;
- activity + ไม่เป็น: someone does not know how;
- ไม่สามารถ + verb phrase (+ ได้): no general capacity, (formal);
- verb phrase + ไม่ไหว: cannot cope with the demand.
ผมซ่อมเครื่องนี้ไม่เป็นครับ
phom som khrueang ni mai pen khrap
I don't know how to repair this machine. (ordinary polite speech, male speaker)
ตอนนี้เราไม่สามารถเปิดระบบได้ค่ะ
ton ni rao mai samat poet rabop dai kha
At present we cannot activate the system. (formal-polite operational statement, female speaker)
Do not confuse ไม่ได้เปิด with เปิดไม่ได้. The former normally denies that opening occurred; the latter denies that opening is possible. This is scope expressed by order, not an English-style change of tense.
เมื่อเช้าผมไม่ได้เปิดร้านครับ
muea chao phom mai dai poet ran khrap
I didn't open the shop this morning. (ordinary polite speech, male speaker; event denied)
กุญแจหาย ประตูเลยเปิดไม่ได้ค่ะ
kunchae hai pratu loei poet mai dai kha
The key is missing, so the door can't be opened. (ordinary polite speech, female speaker; possibility denied)
Ordinary-polite dialogue
กล่องนี้หนักนะคะ ยกไหวไหมคะ
klong ni nak na kha yok wai mai kha
This box is heavy. Can you manage lifting it? (ordinary polite question, female speaker)
ยกไหวครับ แต่ถือขึ้นบันไดคนเดียวไม่ไหว
yok wai khrap tae thue khuen bandai khon diao mai wai
I can lift it, but I can't manage carrying it upstairs alone. (ordinary polite reply, male speaker)
งั้นฉันช่วยถืออีกข้างค่ะ
ngan chan chuai thue ik khang kha
Then I'll help hold the other side. (ordinary polite offer, female speaker)
ดีเลยครับ แบบนี้น่าจะยกขึ้นไปได้
di loei khrap baep ni na cha yok khuen pai dai
Great. This way we should be able to carry it up. (ordinary polite reply, male speaker)
Common Mistakes
1. Putting ability ได้ before the event
❌ ผมได้พูดภาษาไทยครับ
Wrong for the intended general ability; preverbal ได้ does not give the ordinary postverbal ability reading.
✅ ผมพูดภาษาไทยได้พอสมควรครับ
phom phut phasa thai dai phosomkhuan khrap
I can speak Thai reasonably well. (ordinary polite speech, male speaker)
2. Putting เป็น before the learned activity
❌ น้องเป็นว่ายน้ำแล้วค่ะ
Incorrect learned-skill order—the activity precedes เป็น.
✅ ตอนนี้น้องว่ายน้ำเป็นแล้วค่ะ
ton ni nong wai nam pen laeo kha
My younger sibling has learned how to swim now. (ordinary polite speech, female speaker)
3. Using ไหว for know-how without a demanding context
❌ ผมว่ายน้ำไหวครับ
Wrong for the intended neutral claim 'I know how to swim'; ไหว instead evaluates whether swimming is manageable in a situation.
✅ ผมว่ายน้ำเป็นครับ แต่ยังว่ายไม่คล่อง
phom wai nam pen khrap tae yang wai mai khlong
I know how to swim, but I'm not a fluent swimmer yet. (ordinary polite speech, male speaker)
4. Using event denial when inability is intended
❌ ฉันไม่ได้เปิดประตูค่ะ
Wrong for the intended meaning 'I cannot open the door'; this normally says the opening did not occur.
✅ ฉันเปิดประตูไม่ได้ค่ะ มันล็อกอยู่
chan poet pratu mai dai kha man lok yu
I can't open the door; it's locked. (ordinary polite speech, female speaker)
5. Letting สามารถ take a bare language noun
❌ เธอสามารถภาษาไทยค่ะ
Incorrect—สามารถ introduces a predicate, not a bare language object.
✅ เธอสามารถอ่านภาษาไทยได้ค่ะ
thoe samat an phasa thai dai kha
She can read Thai. (formal-polite statement, female speaker)
Key Takeaways
- verb + ได้ presents possibility, permission, practical ability, or success according to context.
- activity + เป็น profiles learned know-how; activity + ไหว profiles enough capacity for the present demand.
- สามารถ + event (+ ได้) is an explicit general-capacity frame, especially in formal and technical language.
- Word order controls scope: ไม่ได้เปิด denies an event, while เปิดไม่ได้ denies possibility.
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- ได้ as Get, Receive, Succeed, and Grammatical MarkerA2 — Use the position of ได้ to distinguish acquisition, event attainment, ability, permission, and success.
- Ability and Opportunity with ได้A2 — Place ได้ after an event to express practical ability or opportunity, and use word order to separate can-do meaning from realized events.
- Learned Skill with เป็นA2 — Use an activity followed by เป็น to express learned know-how, and separate skill from present opportunity or stamina.
- Physical and Situational Capacity with ไหวA2 — Use ไหว after an event to judge whether physical, mental, or situational resources are enough for its demands.
- สามารถ in Neutral and Formal Ability StatementsA2 — Use สามารถ to state explicit capacity in professional, technical, and careful Thai, and contrast it with conversational postverbal ได้.
- Choosing ได้, เป็น, สามารถ, and ไหว for CanA2 — Choose a Thai ability construction by separating practical possibility, learned know-how, explicit capacity, and manageability.