This is the 356th most frequent Finnish word.
työskennellyt
"Työskennellyt" means "worked" in English.
In this sentence, 'työskennellyt' is in the past participle form, used with the verb 'olen' to indicate an action that has occurred over a period of time and is connected to the present.
Olen työskennellyt opettajana kolme vuotta.
I have worked as a teacher for three years.
Here, 'työskennellyt' is used with 'oli' in the past perfect tense, indicating an action completed before another past event.
Hän oli työskennellyt kovasti saavuttaakseen tavoitteensa.
He had worked hard to achieve his goals.
In this example, 'työskennellyt' is combined with 'ovat' to form the present perfect tense, signifying an ongoing action that started in the past and continues in the present.