A) may B) can C) could
A) must B) might C) can
A) might B) can't C) must
A) must'nt B) should C) could
A) ought to B) shall C) must'nt
A) might B) can't C) must
A) might B) may C) should
A) can B) can't C) may
A) can B) may C) must
A) can't B) might C) mustn't |