If a set of WFFs is inconsistent, would the set become consistent by adding more WFFs to it?
No
If you have a set containing only tautologies, is the set consistent?
Yes
If A is consistent with B, and B is consistent with C, does it follow that A must be consistent with C?
No
If A is inconsistent with B, and B is consistent with C, does it follow that A must be inconsistent with C?
No
If X, Y and Z form an inconsistent set of WFFs, then X and Y are inconsistent with each other.
No
If X is an inconsistent WFF, and Y is an inconsistent WFF, then X is inconsistent with Y.
Yes