Learn Finnish: Vihollinen juoksee tänne! - The enemy is running here!

In English, we just say "here" whether we are standing here or running here. But Finnish uses a three-way system for locations: stationary, moving towards, and moving away from. Since the enemy is moving towards our location, we have to use the "to here" form, tänne. Using täällä would mean the enemy is already here and running around in the same spot!

Is there a difference between tänne and tähän if both mean movement to "here"?

Yes. Tänne is used for a general area ("over here" or "to this general place"), which fits the panic of an approaching enemy. Tähän implies a much more specific, pinpointed spot, like telling someone to put a box down exactly on a mark on the floor.

Why does the verb juosta become juoksee here?

Juosta (to run) is a type 3 verb. To conjugate it for a "he/she/it" subject like vihollinen, you find the stem by dropping the -sta and adding -se-, giving us the stem juokse-. For the third-person singular present tense, you simply double the final vowel of the stem, resulting in juoksee.

Is the word vihollinen related to viha (hate)?

Exactly. It originates from the noun viha (hate or anger). From that, you get the verb vihata (to hate), and finally the noun vihollinen (enemy). Recognizing these word families helps you easily guess the meaning of new vocabulary!