Sentence:  I <WSD>can't</WSD> quite get it to work. 
Meaning of the word marked with <WSD> tags:  Cannot (negative auxiliary<ref>Arnold M. Zwicky and Geoffrey K. Pullum, [http://www.stanford.edu/~zwicky/ZPCliticsInfl.pdf "Cliticization vs. Inflection: English "n't], "Language" '''59''' (3), 1983, pp. 502-513</ref>); is unable to; does not have the ability to.