a) I can type twenty-five words a minute.
Ability
b) You should do as you're told
total obligation
c) You don’t need to wait
no obligation
d) It will rain soon
prediction
e) You may leave now if you want to
permission
f) You must be quiet
duty
Foi isso que coloquei no meu, não tenho certeza de que está certo, mas espero ter ajudado.
