A: I use your goggles, please?
B: Yes, of course you can.
A: Is it OK
B: Sure - go ahead.
A: Is it all right to borrow this wetsuit?
B: I'm afraid but you can't. I'm going to use it.
A: Can we take the boat out today?
B: I'm not sure, that's not a good idea. The weather's going to get worse.