From Wikipedia:

• ἀπέκτεινε τὸν ἄνδρα. – He killed the man.
• οὐκ ἐδύνατο καθεύδειν. – He was not able to sleep.
• τί σιγᾷς; οὐκ ἐχρῆν σιγᾶν. – Why are you keeping quiet? You should not be keeping quiet.