English ways to express conditionals
* "if p, then q"
* "if p, q"
* "p is sufficient for q "
* "q if p"
* "q when p"
* "a necessary condition for p is q"
* "q unless not p"
* "p implies q"
* "p only if q"
* "a sufficient condition for q is p"
* "q whenever p"
* "q is necessary for p"
* "q follows from p"