Have you ever ... an alien?
seen
Make a question.
Have you ever caught a fish?
Have you ever (go) canoeing?
gone
Make a question.
Have you ever climbed a tree?
Have you ever ...?
slept in a tent
Have you ever ... a motorcycle?
ridden
Make a question.
Have you ever watched a horror movie?
Have you ever (bake) cookies?
baked
Have you ever (make) a campfire?
made