Learn Finnish: Jalkani on väsynyt.

In standard Finnish, you don't always need a separate word for "my" like minun. Instead, you attach the possessive suffix -ni directly to the noun. So, the base word jalka (leg) becomes jalkani (my leg).

Can jalkani also mean "my foot"?

Yes! The Finnish word jalka is used for both the entire leg and just the foot. You can usually tell from the context which one is meant.

How do we know jalkani means just one leg here?

We can tell it is just one leg because the verb on (is) and the adjective väsynyt (tired) are in the singular form. Interestingly, the word jalkani would look exactly the same if it meant "my legs", so we have to look at the rest of the sentence to know the number.

Why does the word väsynyt end in -nyt?

It is an adjective meaning "tired", but it actually comes from the verb väsyä (to get tired). The -nyt ending shows that the leg has reached a state of being tired. At this level, you can just memorize väsynyt as a regular adjective.