Sentence:  Another woman , addressing Christmas cards , said to her husband : `` We sent them one last year but they did n't send us one , so they <WSD>probably</WSD> won't send us one this year because they 'll think we won't send them one because they did n't last year , do n't you think , or shall we '' ? 
Meaning of the word marked with <WSD> tags:  with considerable certainty; without much doubt