WhVFCT WH-clause after factive verb

conclude concluded concludes concluding demonstrate demonstrated demonstrates demonstrating determine determined determines determining discover discovered discovering discovers find finding finds found knew know knowing known knows learn learning learns learnt mean meaning means meant notice noticed notices noticing notified notifies notify notifying observe observed observes observing prove proved proven proves proving realise realised realises realising realize realized realizes realizing recognise recognised recognises recognising recognize recognized recognizes recognizing remember remembered remembering remembers saw see seeing seen sees show showed showing shown shows understand understanding understands understood