Your spelling, grammar and style checker can be a big help when it comes to irregular verbs—those that aren’t made past tense by adding –ed.  When in doubt, consult an up-to-date dictionary or grammar handbook: Some irregular verbs are in a state of transition from irregular to regular form.

This video with quiz explores how your spelling and grammar checker can help in this area of your writing. If you experience a problem in playing the video, copy and paste this URL into a new browser window:
http://polaris.umuc.edu/ewc/web/irregular_verbs/irregular_verbs.html