muston Basic wordsalso onCEFR Elementary (A2)? CEFR Intermediate (B1)? CEFR Upper intermediate (B2)? Band 1 (BND1)? 必不可少的事物,必须做的事, 应该,得,必须, 一定要,必须 must must(noun) 必不可少的事物,必须做的事 must must(verb) 应该,得,必须 mustn't mustn't(abbreviation) 不可,不能,不许(must not的缩写) mustn't mustn't(verb) 不可,不能,不许 must must(modal) 一定要,必须 Forms nounverbabbreviationmodal must must mustn't must mustn't