Undergo, undergone, underwent.
How to use these word in a sentence or how to use them properly please state some examples.
fallbackFrom=british-grammar
New words, one handy idiom, and a 2-minute quiz — delivered to your inbox to keep your streak alive.
You could have easily looked this up in a dictionary like this one:
http://dictionary.cambridge.org/dictionary/english/undergo?fallbackFrom=british-grammar