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in the PONS Dictionary

I. im·prove [ɪm'pruːv] VB trans

II. im·prove [ɪm'pruːv] VB intr

Present
Iimprove
youimprove
he/she/itimproves
weimprove
youimprove
theyimprove
Past
Iimproved
youimproved
he/she/itimproved
weimproved
youimproved
theyimproved
Present Perfect
Ihaveimproved
youhaveimproved
he/she/ithasimproved
wehaveimproved
youhaveimproved
theyhaveimproved
Past Perfect
Ihadimproved
youhadimproved
he/she/ithadimproved
wehadimproved
youhadimproved
theyhadimproved