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in the PONS Dictionary

alter [ˈɔ:ltəɐ, Am -t̬ɚ] VB trans

1. alter (change):

alter
alter clothes

2. alter Am (castrate):

alter
Present
Ialter
youalter
he/she/italters
wealter
youalter
theyalter
Past
Ialtered
youaltered
he/she/italtered
wealtered
youaltered
theyaltered
Present Perfect
Ihavealtered
youhavealtered
he/she/ithasaltered
wehavealtered
youhavealtered
theyhavealtered
Past Perfect
Ihadaltered
youhadaltered
he/she/ithadaltered
wehadaltered
youhadaltered
theyhadaltered