Learn Turkish: Tavşan gibi hızlı koşmadı. - He did not run fast like a rabbit.

When using gibi (like) with regular nouns such as tavşan (rabbit), the noun stays in its dictionary form. You only need to add case endings when using gibi with certain pronouns, such as benim gibi (like me).

The English translation says "like a rabbit". Why isn't it bir tavşan gibi?

In Turkish, when you make a general comparison, you usually leave out the word bir (a/an). Saying tavşan gibi treats "rabbit" as a general concept for the comparison, which sounds much more natural in Turkish.

hızlı usually means the adjective "fast" or "quick". How does it work as an adverb here?

In Turkish, most adjectives can be used directly as adverbs to describe a verb without changing their form. So, hızlı translates to "quickly" or "fast" when placed right before the verb koşmadı (did not run).

What are the exact parts of the verb koşmadı?

It breaks down into the root koş (run), plus ma (the negative suffix), plus dı (the definite past tense suffix for he/she/it). Together, it means "he/she/it did not run".