A: Have you ever crossed (you / ever / cross) the desert in a jeep?
B: Yes, I have.
A: When did you cross (you / cross) it?
B: I crossed (cross) it last year.
A: Have Eva and Mac ever seen (Eva and Mac / ever / see) a crocodile?
B: Yes, they have.
A: Where did they see (they / see) it?
B: They saw (see) it in Egypt.
A: Has Mac ever climbed (Mac / ever / climb) a high mountain?
B: Yes, he has.
A: When did he climb (he / climb) it?
B: He climbed (climb) it last month.