ПОМОГИТЕЕ ПЛИИЗ С АНГЛ ЯЗ

have you ever ridden a horse?
have you ever seen an elephant?
have you ever made cornflakes?
have you ever climbed a mountain?
have you ever been to london?
no,i havent. I have never been there.
has john ever travelled by plane?
no,he hasnt.
rose has never swum in the sea.Have you ever swum in the sea?