From Proto-Slavic *prosterti (first singular *prostьrǫ), composed of *pro- + *sterti, cognate with Sanskrit स्तृणाति (stṛṇā́ti, “to sprinkle, throw”), स्तृणोति (stṛṇṓti), स्तरति (stárati), Avestan 𐬯𐬙𐬀𐬭𐬀𐬌𐬙𐬌 (staraiti, “to stretch out”), Latvian stirinât (“to move, shake”), Ancient Greek στόρνῡμι (stórnūmi, “to spread”), στορέννῡμι (storénnūmi), στρώννῡμι (strṓnnūmi), Latin sternō (“to spread out”). Past passive participle *prostьrtъ is an exact cognate of Avestan 𐬟𐬭𐬀𐬯𐬙𐬆𐬭𐬆𐬙𐬀 (frastərəta), and base form *stьrtъ is an exact cognate of Sanskrit स्तृत (stṛtá), Ancient Greek στρωτός (strōtós), Latin strātus. Cognate with Old Church Slavonic прострѣти (prostrěti) (first singular простьрѫ (prostĭrǫ)), Serbo-Croatian про̀стриjети (first singular про̏стриjе̄м), Slovene prostrẹ́ti (first singular prostrèm), Czech prostříti, etc.
простере́ть • (prosterétʹ) pf (imperfective простира́ть)
| perfective aspect | ||
|---|---|---|
| infinitive | простере́ть prosterétʹ | |
| participles | present tense | past tense |
| active | — | простёрший prostjóršij |
| passive | — | простёртый prostjórtyj |
| adverbial | — | простере́в prosterév, простёрши prostjórši |
| present tense | future tense | |
| 1st singular (я) | — | простру́ prostrú |
| 2nd singular (ты) | — | прострёшь prostrjóšʹ |
| 3rd singular (он/она́/оно́) | — | прострёт prostrjót |
| 1st plural (мы) | — | прострём prostrjóm |
| 2nd plural (вы) | — | прострёте prostrjóte |
| 3rd plural (они́) | — | простру́т prostrút |
| imperative | singular | plural |
| простри́ prostrí |
простри́те prostríte | |
| past tense | singular | plural (мы/вы/они́) |
| masculine (я/ты/он) | простёр prostjór |
простёрли prostjórli |
| feminine (я/ты/она́) | простёрла prostjórla | |
| neuter (оно́) | простёрло prostjórlo | |