必须

bì xū
HSK 2Adverb (副)

Basic Meaning

adv
Expresses necessity in terms of logic or reason. It is an adverb, so it always precedes a verb or adjective. It is a stronger and more formal obligation than 得(dei3). Note the difference with 必需(bi4 xu1).
must; have to; necessarily required
表示事理上和情理上的必要；一定要。
Words:
必须品必须遵守
Synonyms:
务必必需非得必要一定
Antonyms:
无须不必不用无需
Sentences:
  1. 明(míng)天(tiān)早(zǎo)上(shàng)八(bā)点(diǎn)开(kāi)会(huì)，你(nǐ)必(bì)须(xū)准(zhǔn)时(shí)到(dào)。
    The meeting is at 8 AM tomorrow, you must arrive on time.
  2. 开(kāi)车(chē)时(shí)司(sī)机(jī)必(bì)须(xū)系(xì)好(hǎo)安(ān)全(quán)带(dài)。
    The driver must fasten the seatbelt while driving.
adv
Used to make a command, rule, or instruction sound more forceful and non-negotiable. Often appears in instructions, regulations, or strong advice.
(used to) strengthen an imperative tone; absolutely must
加强命令语气。
Words:
必须执行必须完成必须达标
Synonyms:
务必
Antonyms:
不必不用
Sentences:
  1. 这(zhè)是(shì)公(gōng)司(sī)的(de)规(guī)定(dìng)，必(bì)须(xū)执(zhí)行(xíng)。
    This is the company's rule, it must be implemented.
  2. 为(wèi)了(le)通(tōng)过(guò)考(kǎo)试(shì)，你(nǐ)今(jīn)晚(wǎn)必(bì)须(xū)完(wán)成(chéng)所(suǒ)有(yǒu)练(liàn)习(xí)。
    In order to pass the exam, you absolutely must finish all the exercises tonight.

Characters Breakdown

HSK 2
bì必

certainly

HSK 2
xū须

must; need to; have to