例句 
約3:7 δεῖ ὑμᾶς γεννηθῆναι ἄνωθεν.
It is nessary for you to be born again. (你們必須重生)
(註：主詞是不定詞片語「你們被重生」，故直譯是：你們被重生是必須的)

徒17:3 τὸν χριστὸν ἔδει παθεῖν.
it was necessary for Christ to suffer.
(基督必須受害) (直譯：基督受害是必須的)