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in the PONS Dictionary

un·but·ton [ʌn'bʌtən] VB trans, intr

unbutton
Present
Iunbutton
youunbutton
he/she/itunbuttons
weunbutton
youunbutton
theyunbutton
Past
Iunbuttoned
youunbuttoned
he/she/itunbuttoned
weunbuttoned
youunbuttoned
theyunbuttoned
Present Perfect
Ihaveunbuttoned
youhaveunbuttoned
he/she/ithasunbuttoned
wehaveunbuttoned
youhaveunbuttoned
theyhaveunbuttoned
Past Perfect
Ihadunbuttoned
youhadunbuttoned
he/she/ithadunbuttoned
wehadunbuttoned
youhadunbuttoned
theyhadunbuttoned