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該 — pronunciations, definitions, and tags
HanziPinyinEnglishTags
該gāishould, ought to, mustx, 13 strokes, radical 言
gāi(gai1) T1
  1. 1should, ought to, must
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March 24, 2026

該gāi(gai1)

The character 該 (gāi) expresses obligation or necessity, often translated as 'should,' 'ought to,' or 'must.' It is commonly used in recommendations, advice, or when indicating what is expected or required in a given situation.

Strokes13Radical言
Cultural Note

In Chinese culture, the concept of obligation is often tied to social harmony and collective responsibility. For instance, it is common to hear phrases like '你該幫忙' (nǐ gāi bāngmáng - you should help), which reflects the expectation of mutual assistance in communities.

Memory Tip

Imagine a wise old sage (the character 該) pointing out the right path. The radical 言 (yán) suggests talking or speaking, emphasizing the idea of advice or guidance. You can visualize the sage saying, 'You should take this path to find success,' linking the character's meaning to its pronunciation gāi.

Meanings of 該

gāi(gai1)
1should, ought to, must
Exercise 1 of 2

By ear

Play it, then pick what 該 means.

About 該

該Simplified
13Strokes
言Radical
非语素字non-morpheme character (n-m.)Part of Speech
#—Frequency Rank

Podcast: 該

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Podcast: 該

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AI Study Notes for 該

Quick Contrast

应 (yīng) — use 該 (gāi) when expressing a stronger sense of obligation or necessity compared to the more general recommendation implied by 应 (yīng).

Usage Notes

該 is often used in formal contexts and can sometimes sound strong, similar to 'must' in English. Students should be careful not to confuse it with the informal '应该' (yīnggāi), which is a softer recommendation. Common collocations include '該做' (gāi zuò - should do) and '該去' (gāi qù - should go).

HSK Study Tips

While 該 is not specifically listed in the HSK levels, it can be useful for students at HSK 3 and above as they expand their vocabulary. It connects with other obligation words like 应该 (yīnggāi) and must be practiced in sentence structures to grasp its nuances.

Common Mistakes

Learners often misuse 該 (gāi) for casual suggestions instead of using 应该 (yīnggāi). For example, saying '你該試試' (nǐ gāi shì shì - you should try) can sound too strong; instead, use '你應該試試' (nǐ yīnggāi shì shì).

AI-enhanced 2026-03-24

Pronunciation of 該

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Etymology of 該

Formation Typepictophonetic
六书 ClassificationPhono-semantic (形声字)~80-90% of characters
Explanation

Simplified form of 該. Phonosemantic compound. 言 represents the meaning and 亥 represents the sound.

Memory Hint

speech

Semantic (meaning)言
+
Phonetic (sound)亥
Learn more about Phono-semantic (形声字) characters
Exercise 1 of 1

Origin

該 = 言 + 亥. What kind of character does that make it?

Decomposition of 該

IDS Structure⿰言亥
該Full Character
=
言yan2
left
亥hai4
right
Exercise 1 of 2

Parts

Which of these is part of 該?

How to say should, ought to, must in Chinese

“should, ought to, must” in Chinese is該gāi

The character 該 (gāi) expresses obligation or necessity, often translated as 'should,' 'ought to,' or 'must.' It is commonly used in recommendations, advice, or when indicating what is expected or required in a given situation.

When to use 該

該 is often used in formal contexts and can sometimes sound strong, similar to 'must' in English. Students should be careful not to confuse it with the informal '应该' (yīnggāi), which is a softer recommendation. Common collocations include '該做' (gāi zuò - should do) and '該去' (gāi qù - should go).

該 or something close to it

应 (yīng) — use 該 (gāi) when expressing a stronger sense of obligation or necessity compared to the more general recommendation implied by 应 (yīng).

What learners get wrong

Learners often misuse 該 (gāi) for casual suggestions instead of using 应该 (yīnggāi). For example, saying '你該試試' (nǐ gāi shì shì - you should try) can sound too strong; instead, use '你應該試試' (nǐ yīnggāi shì shì).

Write 該

該

Practice writing 該 stroke by stroke. Watch the animation to learn the stroke order, then try writing it yourself.

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Word Family of 該

Words Containing This Character7
该gāishould該
应该yīnggāiought to應該
该死Damn it!該死
不该should not不該
活该huógāiought活該
该当should該當
合该ought to合該
Exercise 1 of 4

Characters with 該

What does 该 mean?

Frequently Asked Questions about 該

該 (gāi) is often used in more formal or strong recommendations, while 应该 (yīnggāi) suggests a softer, more common way to express what one ought to do.

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