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in the PONS Dictionary

I. un·do <-did, -done> [ʌn'duː] VB trans

1. undo (unfasten):

undo
undo buttons, zip

2. undo (cancel):

3. undo (ruin):

undo

Phrases:

II. un·do <-did, -done> [ʌn'duː] VB intr

undo button:

undo
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