A woman wearing an apron is working .
It is improbable that a woman is wearing an apron so she does n't spill anything on her .
There is a very good chance that a woman is wearing an apron so she does n't spill anything on her .
It is improbable that a woman is wearing an apron so she does n't spill anything on her .
a woman is wearing an apron so she does n't spill anything on her .