A man wearing glasses is staring off into space .
It is probably the case that a man is staring off into space , as the class he is taking is boring .
There is almost no chance that a man is staring off into space , as the class he is taking is boring .
It is probably the case that a man is staring off into space , as the class he is taking is boring .
A man is staring off into space , as the class he is taking is boring .