2.I have never seen an elephant.
3.Have you ever acted in a play?
4.Have Helen ever been to China?
5.Bill and Jack have never visited to an aquarium.
6.I have never argued with my parents.
7.My friends have never eaten Chinese food.
8.Have they ever swum in the sea?
9.Have you ever seen a film in English?
10.We have never eaten lemon ice cream.