Помогите пожалуйста кто хорошо знает английский, помогите вставьте правильно may или can. I .. be able to help you. I

I may be able to help you. I can not swim, because until this year the doctor did not allow me to be more than two minutes in the water. But this year he says I may stay in for fifteen minutes if I like,so I\'m going to learn to swim. Libraries are quite free, and any one who likes may get books there. I can come and see you tomorrow if I have time. Take your raincoat with you: it may rain today. Do you think you can do that? I can finish the work tomorrow if no one bothers me any more. May we come and see you next Sunday at three o\'clock in the afternoon? What time is it? - It may be about six o\'clock,but I am not sure. Only a person who knows the language very well can answer such a question.