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Besides this, the grammatical forms and constructions in Russian are very peculiar, and present a great many strange irregularities. As an illustration of this we may take the future tense. The Russian verb has commonly a simple and a frequentative future. The latter is always regularly formed by means of an auxiliary with the infinitive, as in English, but the former is constructed in a variety of ways, for which no rule can be given, so that the simple future of each individual verb must be learned by a pure effort of memory. In many verbs it is formed by prefixing a preposition, but it is impossible to determine by rule which preposition should be used. Thus idu (I go) becomes poidu; pishu (I write) becomes napishu; pyu (I drink) becomes vuipyu, and so on.
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