Is this an 'only if' sentence, or a 'if' sentence? The sentence is:
Bertha eats only regularly if Anna does.
The only abbreviations are:
Anna eats regularly
B: Bertha eats regularly
Is this an 'only if' sentence or a 'if, then' sentence.
Is it symolized (if):
A -> B
or (only if):
'not A' -> 'not B'
alternatively: B -> A 
Why I ask is because I get the impression that she maybe would have normally eaten a lot, but if Anna eats regularly, then she also does it.
Any thoughts?
