undergo的过去式和过去分词是什么？

undergo的过去式：underwent；
undergo的过去分词：undergone
underwent
v、 经验；遭遇（undergo的过去式）。
undergone
v、 经历（undergo的过去分词）。

例句：

She later underwent 19 operations、

之后她接受了19次整容手术。

Last year, Ms、 Mason underwent surgery、

梅森女士于去年动了手术。

The promising singer underwent mysterious misery、

那位有前途的歌手遭受了神秘的痛苦。

Design itself has undergone deep changes as well、

设计本身了已经经历了深刻的变化。

I learnt that you had just undergone an operation、

我得知你刚经历了一场手术。

Her smile had also undergone a transformation、

她的笑容也改变了。