Sentence:  I stumbled along through the young pines and huckleberry bushes. Pretty soon I struck into a sort of path that, I cal'lated, <WSD>might</WSD> lead to the road I was hunting for. It twisted and turned, and, the first thing I knew, made a sudden bend around a bunch of bayberry scrub and opened out into a big clear space like a lawn. 
Meaning of the word marked with <WSD> tags:  (may) Used to indicate possibility in past tense.