Learn Russian: Здесь огромный корень, не оступись и не упади. - There is a huge root here, don't lose your footing and don't fall.

Здесь огромный корень, не оступись и не упади.

There is a huge root here, don't lose your footing and don't fall.

Breakdown of Здесь огромный корень, не оступись и не упади.

Questions & Answers about Здесь огромный корень, не оступись и не упади.

Why do не оступись and не упади use the perfective aspect here? I thought negative commands usually take the imperfective.

You are right that negative commands telling someone not to do something intentionally usually take the imperfective. However, these verbs are perfective because they are warnings against accidental, unwanted events. When you warn someone to avoid a mishap, like slipping or falling, you use не plus the perfective imperative.

The verb оступись ends in -сь. Is this a reflexive verb?

Yes, it comes from the perfective verb оступиться (to stumble or lose one's footing). In the imperative form, the reflexive ending -ся shortens to -сь because it directly follows a vowel (и).

Корень ends in a soft sign. How do we know it is masculine, matching the adjective огромный?

Nouns ending in a soft sign (-ь) can be masculine or feminine, so you often just have to memorize their gender. However, a helpful pattern to remember is that many nouns ending in -ень, such as день (day), камень (stone), and корень (root), are masculine.

How is the imperative упади formed from the infinitive упасть?