conv: I have to go rock climbing with some friends. I have practiced climbing indoors_comma_ but have never done a big climb outside so who knows how it will go. I'm going rock climbing with some friends! That sounds fun and scary! You must be pretty fit to take on that challenge. I have done some climbing indoors for practice_comma_ but never done a big climb out doors_comma_ so who know how it will go. I'm sure that there will be some differences_comma_ but I'm sure you will nail it! Just remember to be safe!