Questions & Answers about Tämä on pieni ihme.
- Tämä = this
- on = is (from the verb olla, to be)
- pieni = small, little
- ihme = miracle, wonder
So the sentence is literally This is a small miracle.
On is the 3rd person singular form of olla (to be).
Here, the subject is tämä (this), which takes the same verb form as he/she/it in English:
- minä olen = I am
- sinä olet = you are
- hän on = he/she is
- tämä on = this is
So Tämä on... means This is...