| 1 | 必要 | 必要 | bì yào | bi4 yao4 | necessary; essential; indispensable; required | | |
| 2 | 必然 | 必然 | bì rán | bi4 ran2 | inevitable; certain; necessity | | |
| 3 | 必 | 必 | bì | bi4 | certainly; must; will; necessarily | | |
| 4 | 必需 | 必需 | bì xū | bi4 xu1 | to have to; must; compulsory; necessarily; to need; to require; essential; indispensable | | |
| 5 | 必定 | 必定 | bì dìng | bi4 ding4 | to be bound to; to be sure to | | |
| 6 | 必将 | 必將 | bì jiāng | bi4 jiang1 | inevitably | | |
| 7 | 必不可少 | 必不可少 | bì bù kě shǎo | bi4 bu4 ke3 shao3 | absolutely necessary; indispensable; essential | | |
| 8 | 必要条件 | 必要條件 | bì yào tiáo jiàn | bi4 yao4 tiao2 jian4 | requirement; necessary condition (math) | | |
| 9 | 必要性 | 必要性 | bì yào xìng | bi4 yao4 xing4 | necessity | | |
| 10 | 必胜 | 必勝 | bì shèng | bi4 sheng4 | to be certain of victory; to be bound to prevail | | |
| 11 | 必需品 | 必需品 | bì xū pǐn | bi4 xu1 pin3 | necessity; essential (thing) | | |
| 12 | 必死之症 | 必死之症 | bì sǐ zhī zhèng | bi4 si3 zhi1 zheng4 | terminal illness; incurable condition (also fig.) | | |
| 13 | 必先 | 必先 | bì xiān | bi4 xian1 | must come first | | |
| 14 | 必修 | 必修 | bì xiū | bi4 xiu1 | (of an academic course) required; compulsory | | |
| 15 | 必修课 | 必修課 | bì xiū kè | bi4 xiu1 ke4 | required course; compulsory course | | |
| 16 | 必然结果 | 必然結果 | bì rán jié guǒ | bi4 ran2 jie2 guo3 | inevitable outcome; inescapable consequence | | |
| 17 | 必应 | 必應 | bì yìng | Bi4 ying4 | Bing (search engine) | | |
| 18 | 必由之路 | 必由之路 | bì yóu zhī lù | bi4 you2 zhi1 lu4 | the road one must follow or take; the only way | | |
| 19 | 必有重谢 | 必有重謝 | bì yǒu zhòng xiè | bi4 you3 zhong4 xie4 | (we) will be very grateful (if ...) | | |
| 20 | 必胜客 | 必勝客 | bì shèng kè | Bi4 sheng4 Ke4 | Pizza Hut | | |
| 21 | 必然王国 | 必然王國 | bì rán wáng guó | bi4 ran2 wang2 guo2 | realm of necessity (philosophy) | | |
| 22 | 必经之路 | 必經之路 | bì jīng zhī lù | bi4 jing1 zhi1 lu4 | the road one must follow or take; the only way; same as 必由之路 | | |
| 23 | 必经 | 必經 | bì jīng | bi4 jing1 | unavoidable; the only (road, entrance etc) | | |
| 24 | 必和必拓 | 必和必拓 | bì huó bì tuò | Bi4 huo2 Bi4 tuo4 | BHP Billiton (Anglo-Australian mining corporation) | | |
| 25 | 必恭必敬 | 必恭必敬 | bì gōng bì jìng | bi4 gong1 bi4 jing4 | variant of 毕恭毕敬 | | |