my contributions is to an other interesting set of irregular verbs.. like the spring/sprang/sprung...

this is a YART--but its so much fun...

nigh/near/next

i never put them 'together'(i read them somewhere) and i was gobsmacked...
spring them on your students, WW... i suppose only wordies like us are going to be impressed.. but maybe you'll out a wordie, or create one..