Mark 9:28

NIV: After Jesus had gone indoors, his disciples asked him privately, "Why couldn't we drive it out?"

NAS: When He came into the house, His disciples began questioning Him privately, "Why could we not drive it out?"

KJV: And when he was come into the house, his disciples asked him privately, Why could not we cast him out?

GWT: When Jesus went into a house, his disciples asked him privately, "Why couldn't we force the spirit out of the boy?"

ASV: And when he was come into the house, his disciples asked him privately, How is it that we could not cast it out?

BBE: And when he had gone into the house, his disciples said to him privately, Why were we unable to send it out?

DBY: And when he was entered into the house, his disciples asked him privately, Wherefore could not we cast him out?

DRB: And when he was come into the house, his disciples secretly asked him: Why could not we cast him out?

WBS: And when he had come into the house, his disciples asked him privately, Why could not we cast him out?

WEB: When he had come into the house, his disciples asked him privately, "Why couldn't we cast it out?"

YLT: And he having come into the house, his disciples were questioning him by himself -- 'Why were we not able to cast it forth?'