NS4-U4-P2-Present perfect + time indicators

Perhaps you ... (to float) down a river in the summer.

Perhaps you have floated down a river in the summer and ... (to swim) in a lake.

Perhaps you have floated down a river in the summer and have swum in a lake but ... never ... (to do) this in water at -15°C.

Maybe you ... (to play) football with your mates.

Maybe you have played football with your mates and ... (to score) many goals.

Maybe you have played football with your mates and have scored many goals but ... (not to play) in a bubble suit yet.

... you ever ... (to walk) on natural ice?

Have you ever walked or ... you ... (to skate) on natural ice?

Have you ever walked or have you skated on natural ice? Certainly you ... (to hear) of curling.

Have you ever walked or have you skated on natural ice? Certainly you have heard of curling, but ... you ... (to try) it on natural ice?