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in the PONS Dictionary

undo <undid; undone> [ˌʌnˈduː] VB trans

1. undo:

undo
解开 jiěkāi
undo
打开 dǎkāi

2. undo:

undo
消除 xiāochú
undo
破坏 pòhuài
What's done cannot be undone. prov
覆水难收。
Present
Iundo
youundo
he/she/itundoes
weundo
youundo
theyundo
Past
Iundid
youundid
he/she/itundid
weundid
youundid
theyundid
Present Perfect
Ihaveundone
youhaveundone
he/she/ithasundone
wehaveundone
youhaveundone
theyhaveundone
Past Perfect
Ihadundone
youhadundone
he/she/ithadundone
wehadundone
youhadundone
theyhadundone
See further verb tables