English Language Free Course.

The verb forms are the present, the past and past participle.

buy, bought, bought - kupować

The present

I buy a car every year.
Kupuję samochód co roku.

The past

I bought a car yesterday.
Kupiłem samochód wczoraj.

The past participle

I have bought four cars this year.
W tym roku kupiłem 4 samochody.