John 3:2

ἦλθεν πρὸς αὐτὸν νυκτὸς καὶ εἶπεν αὐτῷ· ῥαββί, οἴδαμεν ὅτι ἀπὸ θεοῦ ἐλήλυθας διδάσκαλος· οὐδεὶς γὰρ δύναται ταῦτα τὰ σημεῖα ποιεῖν ἃ σὺ ποιεῖς, ἐὰν μὴ ᾖ ὁ θεὸς με αὐτοῦἦλθεν πρὸς αὐτὸν νυκτὸς καὶ εἶπεν αὐτῷ· ῥαββί, οἴδαμεν ὅτι ἀπὸ θεοῦ ἐλήλυθας διδάσκαλος· οὐδεὶς γὰρ δύναται ταῦτα τὰ σημεῖα ποιεῖν ἃ σὺ ποιεῖς, ἐὰν μὴ ᾖ ὁ θεὸς με αὐτοῦ

He came to him by night and said to him Rabbi we know that you are a teacher sent from God. For no one is able to do all the signs that you do, unless God be with him


 * νυκτὸς - notice there is no need for a preposition. Reader is meant to fill it in.
 * οἴδαμεν - we know. Pluperfect active indicative 1P pl.
 * διδάσκαλος - teacher. Again, no preposition.
 * δύναται ταῦτα τὰ σημεῖα ποιεῖν - notice δύναται needs to be followed by a complementary infinitive ποιεῖν to give more information about what he is able to.
 * ἐὰν μὴ - we hardly notice it in English, but ἐὰν μὴ just like unless, would typically be followed by a subjunctive. In this case a subtle one ᾖ (be).