Be careful climbing that tree. You (can / could) fall.
The answer is "could".
I would choose "could" if I had to, but I can't seem to explain why "can" doesn't work here.
Be careful climbing that tree. You (can / could) fall.
The answer is "could".
I would choose "could" if I had to, but I can't seem to explain why "can" doesn't work here.
Both "can" and "could" can be used here, but "could" sounds better.
"Can" usually means the ability of someone to do something, but in this case it uses the other meaning of "possibility of something happening", so "could" would be slightly better
As what @KateBunting has said, "Can" is more often used of things a person might want to do rather than a risk they run, so if you had the choice in this case, pick "could", as in this context the person is probably getting something (maybe not running up the tree for fun).
Not only does it sound better using "could", if you say "you can fall" to someone, sounds as though you think they might want to!