Definition

Adverb: - Surely, certainly, undoubtedly: Used to express a high degree of certainty or conviction about a statement, often based on logical deduction or strong belief. It indicates the speaker is almost sure something is true or will happen.

Usage Examples

• Adverb:
  • Chắc hẳn cô ấy đã về nhà rồi. (She has surely/certainly gone home already.)
  • Chắc hẳn anh ấy sẽ rất vui khi nhận được tin này. (He will undoubtedly be very happy to receive this news.)
  • Chắc hẳn trời sẽ mưa. (It will probably/surely rain.)

Advanced Usage

• "Chắc hẳn là...": "It must be that...", "Surely it is that...". This structure reinforces the assumption.
  • Chắc hẳn là cô ấy đã quên cuộc hẹn. (It must be that she forgot the appointment.)
• Used to introduce a conclusion or assumption the speaker believes is very likely true, often at the beginning of a sentence.
  • Chắc hẳn, mọi người đều biết sự thật. (Surely, everyone knows the truth.)

Variants and Related Words

• Chắc chắn (adverb/adjective): Definitely, certain, sure. This is a stronger and more definitive term than "chắc hẳn".
  • Tôi chắc chắn sẽ đến. (I will definitely come.)
• Hẳn (adverb): Probably, surely. Often used similarly but can sound slightly more literary or formal.
  • Ông ấy hẳn đã hiểu. (He surely understood.)
• Chắc (adjective/adverb): Sure, certain, firm. Can function as an adjective meaning "firm" or an adverb meaning "probably".
  • Tôi chắc điều đó. (I am sure of that.)

Synonyms

• Chắc chắn: Certainly, definitely.
• Ắt hẳn: Surely, undoubtedly (more literary).
• Hẳn nhiên: Naturally, of course.
• Chắc là: Probably, it's likely that.

Related Phrases / Idioms

• "Không chắc hẳn": Not entirely sure/certain. This is a negated form expressing doubt.
  • Tôi không chắc hẳn về kết quả. (I am not entirely sure about the result.)

1. Surely, certainly