Choose the proper word from the brackets: 1) (Can/May) I play the piano? 2) Can/May) John watch TV before going to bed? 3) (Can/May) your friend speak English? 4) I think I (can/may) do the work myself 5) You (can/may) stay a little longer, if you like 6) I (cannot/may not) hear you from the distance 7) You (can/may) take the article home 8) (Can/May) I see you tonight? 9) (Can/May) I find you there ronight? 10) You (can/may) read this article. You have knowledge enough 11) You (can/may) take this book, I dont need it 12) A fool (can/may) ask more questions than a wise man (can/may) answer 13) Something was wrong with the receiver, I (can/may) not hear you 14) I (can/may) give you my book for a couple of days

В общем,can ставится со значением способен,умею.
А May в значении разрешается.
1)May
2)May
3)Can
4)Can
5)May
6)Cant
7)May
8)May
9)May
10)Can
11)May
12)Can.Can
13)Can
14)Can