Different ways to express If-Then What are some different ways to write the conditional statement $p\implies q\,$, but in English?
There's the obvious "If p, then q", but are there any other ways to write it? I'm looking for another 3 or 4 ways to express this.
 A: "p only if q"
"q whenever p"
"q if p"
"q is a necessary condition for p"
"q unless not p"
A: Different ways to write, or express, the conditional statement $p \rightarrow q$ besides "if $p$ then $q$."


*

*"$p$ is a sufficient condition for $q$"; or

*"$p$ only if $q$";

*"$p$ implies $q$";

*"$q$ whenever $p$"

*"$q$ is a necessary condition for $p$" (i.e., "if not $q$, then not $p$", or $\lnot q \rightarrow \lnot p$);

*"$q$ is a consequence of $p$";

*"$q$ follows from $p$";

*"$q$ if $p$".

*"if not $q$, then not $p$."

*"not $p$, or $q$"

*"not ($p$ and not $q$)


Logically, we can write $(10)$ as $$(p \rightarrow q) \equiv (\lnot p \lor q)$$ and $(11)$ as $$(p \rightarrow q) \equiv \lnot(p \land \lnot q)$$
Those are just a few of the ways one can express "if $p$, then $q$."  But some expressions may be more intuitive than others.
One final note: The term "unless" also relates to "if and only if" in the following sense: as in "$p$ unless $q$" is equivalent to "unless $q$, then $p$" which is equivalent to "if not $q$, then $p$".
A: The proposition $P\Rightarrow Q$ is logically equivalent to 
$$\sim P \vee Q.$$
A: There appears to be some confusion in several answers above, I do not have sufficient reputation points to add a comment to the question and it seem rude to edit the answer 
p⟹q
does not imply
q⟹p
let p be "john drives to another city"
let q be "john gets in a car"
If "John drives to another city" then "John gets in a car"
but it does not follow that 
If "John gets in a car" then "John drives to another city"
For a numeric equivalent 
let p be x = 4 
let q be x^2 = 16
If x=4 then x^2=16
but it does not necessarily follow that 
If x^2=16 then x=4 
Hence only the following are true:


*

*q whenever p

*q if p

*p is a sufficient condition for q

*p implies q

*q follows from p

*q is a consequence of p

*not p, or q

*not (p and not q)

A: "p only if q" should be added as well. The sentence "p only if q" should not be confused with "p if q". 
