2. you/ever/swim/in the sea?
A: Have you ever swum in the sea?
B: Yes, I have. / No, I haven't.
3 you/ever/climb/a mountain?
A: Have you ever climbed a mountain?
B: Yes, I have. / No, I haven't.
4 you/ever/be/in an aeroplane?
A: Have you ever been in aeroplane?
B: Yes, I have. / No, I haven't.