กี่ and Classifier Questions

To ask “how many?” about an ordinary count noun, Thai places กี่ in the numeral slot and follows it with the noun's classifier: หนังสือกี่เล่ม “how many books?”, ลูกค้ากี่คน “how many customers?”, รถกี่คัน “how many vehicles?” The order is noun + กี่ + classifier.

English places how many before a plural noun. Thai keeps the noun first, does not pluralize it, and uses a classifier after กี่. The question and answer therefore share one productive frame.

Replace the numeral with กี่

The answer omits หนังสือ but retains เล่ม. The classifier makes “three [volumes]” recoverable.

The classifier is selected by the intended unit

คน packages people; คัน packages vehicles. General อัน cannot replace either merely because the learner has not recalled the specific classifier.

The same noun can invite different units. กาแฟกี่แก้ว asks about prepared servings in glasses/cups; กาแฟกี่ถุง asks about bags of coffee.

Classifier choice is part of the question: it tells the respondent what counts as one answerable unit.

Noun ellipsis in a known context

When the noun is active, กี่ + classifier can stand alone:

ใบ preserves the container class after กล่อง is omitted. If the antecedent were books, กี่เล่ม and สองเล่มนี้ would preserve the volume class instead.

Demonstrative นี้ follows the classifier in the answer. กี่ asks for an unknown number; the answer supplies a number and may then identify the selected set with นี้. Never move the demonstrative before the noun to imitate English these boxes: กล่องสองใบนี้ keeps นี้ at the end of the classifier phrase.

กี่ with times, ages, and measures

Several highly frequent questions use a unit word directly:

กี่โมง asks which hour/time; กี่บาท asks how many baht; อายุเท่าไร asks age in an open-ended way. กี่ and เท่าไร overlap in some quantity questions, but กี่ characteristically expects a count with a unit or classifier. เท่าไร also asks price, degree, or amount.

คืน serves as the counted time unit. No separate plural form appears.

Cardinal quantity versus ordinal identity

กี่ + classifier asks the size of a set. Classifier + ที่เท่าไร asks the position of one member. The ordinal guide develops that second pattern and its contrast with cardinal counting.

The first answer might be สามห้อง “three rooms”; the second ชั้นที่หก “the sixth floor.” Do not use กี่ to mean which numbered one without the appropriate ordinal construction.

This distinction reflects two different information gaps. With กี่, the speaker knows the kind of thing and asks for the total number of units. With ที่เท่าไร, the speaker presupposes an ordered sequence and asks where one member falls within it. English can blur the difference with what number, so build the Thai question from the expected answer: สามคัน calls for กี่คัน, while คันที่สาม calls for คันที่เท่าไร.

A counting dialogue

Thai verbs do not conjugate for future time; พรุ่งนี้ supplies it. The person and furniture classifiers make the two counts explicit.

Common Mistakes

1. Copying English “how many + noun” order

2. Omitting the classifier

3. Using อัน indiscriminately

4. Confusing count with rank

Key Takeaways

Ask a cardinal count with noun + กี่ + classifier and answer with number + classifier. Omit the noun when context supports it, but retain the semantic classifier. Use classifier + ที่เท่าไร for ordinal position, and let classifier choice specify whether you are counting people, vehicles, servings, packages, or another unit.