Thank you Jonne, very interesting lesson, here is what I could solve

, please correct me:
Jonnin (or Jonnen) lehmä on iso. Sillä on isot silmät mutta pieni nenä ja suu. Nanin

mielestä se on lihava kuin possu.
Nice if you liked it
i always afraid that i teach WAY too much in one lesson..i think i did so in lesson 5 lol. well.. just take more time to learn it then, or learn it in two parts
i also noticed that i'm teaching a lot of grammar..from this on i will have some short texts, just like in this lesson.
then the corrections:
It's Jonnen. "Jonni" is a name too so Jonni's would be Jonnin. Otherwise good :D
from päivi = päiviltä
- from taru = tarulta
- from pasi = pasiltä
Pasilta
- from mika = mikalta
When do we use -lta or -ltä
I explained this in some lesson (second?). There are three kinds of vowels in finnish;
front vowels, made in front of your mouth - A O U
middle vowels, made in the middle - I E
back vowels, made in the back - Y Ä Ö. A single word cannot have both front&back vowels (except in compounds for sure). the vowels decide the ending. If the word has any front vowels, the ending has them too, if the word has any back vowels, the ending has them too and if the word has only middle vowels, the word has front vowels. you just have to learn this rule. Therefore it's
- salim has a cow = Salimalla on lehmä
Salimilla. The extra vowel is i.
- nani has a pig = Nanillä on possu (I'm glad I'm not the one who got the pig

)
Nanilla. NANI has back and middle vowels, and back (or front) vowels beat middle so the ending has to have back vowels too.
- asma has a car = Asmalla on auto (lucky Asma)
again my question is when do we use -lla instead of -llä
I explained it already
since the word cannot have back and front vowels mixed, the ending has to have same vowels as the word. and of course, middle vowels are neutral so they can be mixed with back and front.