How to say the English -ed form in Finnish

Sometimes my students say things like Tämä on tehnyt Suomessa when it should be Tämä on tehty Suomessa. (This is/was made in Finland). Notice how Finnish has THREE different verb forms that can mean the same as the English past participle form of a verb. You know, the -ed form or something irregular. 

1. tehnyt is an active past participle
2. tehty is a passive past  participle
3. tekemä is an agent participle

Here are more examples: 

baked

1. En ole leiponut mitään pitkään aikaan. - I haven't baked anything for a long time. 
2. Tämä on leivottu rakkaudella. - This is baked with love. 
3. Tämä on kaikkien aikojen paras leipomani kakku! - This is the best cake I've ever baked. 

written

1. Oletko sinä kirjoittanut tämän? - Have you written this?
2. Tämä on kirjoitettu kauan sitten. - This was written (has been written) a long time ago.
3. Kenen kirjoittama tämä on? - Who wrote this? (By whom is this written?)

built

1. En ole koskaan rakentanut mitään. - I have never built anything.
2. Tämä talo on rakennettu 1960-luvulla.  - This house was built (is built) in the 60's.
3. Tämä talo on isäni rakentama. - This house was built (is built) by my father. 

About the author of Random Finnish Lesson: 

My name is Hanna Männikkölahti. I am a professional Finnish teacher who gives private online lessons and simplifies books into easy Finnish. Please read more in www.linktr.ee/hannamannikkolahti and follow this blog, if you want to be the first one to know when I post something new.