18 verses have
but
in Edition Clear Qur'an by Talal Itani / Al-Anbiyaa (The Prophets)

21:1Mankind’s reckoning has drawn near, but they turn away heedlessly.

21:2No fresh reminder comes to them from their Lord, but they listen to it playfully.

21:3Their hearts distracted, the wrongdoers confer secretly, “Is this anything but a mortal like you? Will you take to sorcery, with open-eyes?”

21:13Do not run, but come back to your luxuries, and to your homes, that you may be questioned.

21:23He will not be questioned about what He does, but they will be questioned.

21:24Or have they taken, besides Him, other gods? Say, “Bring your proof. This is a message for those with me, and a message of those before me.” But most of them do not know the truth, so they turn away.

21:25We never sent a messenger before you without inspiring him that: “There is no god but I, so worship Me.”

21:26And they say, “The Most Merciful has taken to himself a son.” Be He glorified; they are but honored servants.

21:41Messengers before you were also ridiculed, but those who jeered were surrounded by what they had ridiculed.

21:42Say, “Who guards you against the Merciful by night and by day?” But they turn away from the mention of their Lord.

21:45Say, “I am warning you through inspiration.” But the deaf cannot hear the call when they are being warned.

21:63He said, “But it was this biggest of them that did it. Ask them, if they can speak.”

21:65But they reverted to their old ideas: “You certainly know that these do not speak.”

21:70They planned to harm him, but We made them the worst losers.

21:82And of the devils were some that dived for him, and performed other, lesser tasks. But We kept them restrained.

21:87And Jonah, when he stormed out in fury, thinking We had no power over him. But then He cried out in the darkness, “There is no god but You! Glory to You! I was one of the wrongdoers!”

21:93But they splintered themselves into factions. They will all return to Us.

21:109But if they turn away, say, “I have informed you sufficiently. Although I do not know whether what you are promised is near or far.”