Student or Learner
Good evening, I know that for the future, "will be able" is a good substitute for "can".
However, I´ve noticed, that "can" can be used for future abilities as well.
E. g. I can start working an hour later tomorrow should be OK, while *She can swim after she finishes our course is incorrect and "will be able" should be used instead.
So what´s the rule? I think I´ve seen somewhere that if we talk about decisions done at the time of speaking, we can use "can", and when we talk about future abilities, we can´t use it.
Or is it related to being allowed to do something? The first sentence seems to me to express exactly the idea - I am allowed to start later or I can afford to start later..
Thank you very much :)