challenging

challenging { occurrence | progressive | present }    FACTIVE    move { occurrence }

PRI19980216.2000.0170.sgm.SYN.tmlR.tmx3.patrick.tml
But we 're challenging it on the ground that uh the RUC uh have offered an opinion, and this opinion is going to be used as a mechanism for ejecting us from the talks , and uh that's a very serious.

challenging { occurrence | progressive | present }    MODAL    offered { occurrence | perfective | present }

PRI19980216.2000.0170.sgm.SYN.tmlR.tmx3.patrick.tml
But we 're challenging it on the ground that uh the RUC uh have offered an opinion, and this opinion is going to be used as a mechanism for ejecting us from the talks , and uh that's a very serious.