-eat a snake
You have eaten a snake.
We haven't eaten a snake. / We have never eaten a snake.
-swim in a cold lake
We have swum in a cold lake.
They haven't swum in a cold lake. / They have never swum in a cold lake.
-be on TV
My cousin Dan has been on TV.
You haven't been on TV. / You have never been on TV.
-go to another country
They have gone to another country.
Dolly hasn't done to another country.
-write a blog
I have written a blog.
You haven't written a blog.
-speak English outside class
Alex has spoken English outside class.
You haven't spoken English outside class.
-go scuba diving
The Simpsons have gone scuba diving.
The Browns haven't gone scuba diving.
-eat a snake
You have eaten a snake.
We haven't eaten a snake. / We have never eaten a snake.
-swim in a cold lake
We have swum in a cold lake.
They haven't swum in a cold lake. / They have never swum in a cold lake.
-be on TV
My cousin Dan has been on TV.
You haven't been on TV. / You have never been on TV.
-go to another country
They have gone to another country.
Dolly hasn't done to another country.
-write a blog
I have written a blog.
You haven't written a blog.
-speak English outside class
Alex has spoken English outside class.
You haven't spoken English outside class.
-go scuba diving
The Simpsons have gone scuba diving.
The Browns haven't gone scuba diving.