A: [At the railway station] "Ah, my train has arrived. I must get on board."Could you please tell me whether TO BE SURE can be used in the sentences said by B and C?
A: I saw a ghost.
You are sure not to be serious.You cannot be serious.
You are sure to have had a hallucination.You must have had a hallucination.
Is using the passive form of the bold part possible?A: "Excuse me, I am lost. I am looking for a house called "Ash Grove". Do you know where it is?"
B: "Yes. Go as far as the church and turn left. It is the only house with a red roof in that road, you are sure to see it." -> You are certain to .