Prepositions play an important role in governing nouns or pronouns. Some prepositions can be used in several cases and their use depends on the context. Prepositions in Russian and English rarely match. Prepositions can be divided into two groups according to their origin. Primary prepositions that are not derived from other words. Secondary prepositions are derived from adverbs, nouns, verbs or gerunds. Primary prepositions form the largest and most frequently used group of prepositions. Many primary prepositions can appear with more than one case. This chapter provides the most common primary prepositions, along with the cases with which the preposition can be used. The secondary preposition looks identical to the word from which the preposition is derived, but has a different function. Secondary prepositions are common in writing. Unlike primary prepositions, secondary prepositions are usually used with one particular case.