Posted by Jen on .
Form the converse: If I do not mow the lawn, then the grass grows too tall.
Is it:
If the grass does not grow too tall, then I did not mow the lawn??

Math 
MathMate,
Here is list of the four possibilities (source: (Broken Link Removed)
* statement: if p then q
* converse: if q then p
* inverse: if not p then not q
* contrapositive: if not q then not p
Your proposition is not one of them.
Let
p=I don't mow the lawn
q=grass grows too tall
The original statement is then
if p then q
The converse: if q then p
i.e. if the grass grows too tall, then I didn't mow the lawn.
You have proposed: if ~q then p
"If the grass does not grow too tall, then I did not mow the lawn" which is not one of the four usual variations. 
Math 
Jen,
so its:
If the grass grows too tall, then I did not mow the lawn?? 
Math 
MathMate,
Correct.

Math 
Jen,
yay! i get it now :) thanks!

Math :) 
MathMate,
You're welcome!