-s beds, books, horses regular irregular Ø sheep, fish, deer ablaut man men, foot feet, goose geese, mouse mice, louse lice [+voi] + -s calf calves, knife knives, leaf leaves, shelf shelves -en child children, ox oxen foreign -on -a criterion criteria, phenomenon phenomena -um -a curriculum curricula, stratum strata, symposium symposia -is -es analysis analyses, crisis crises, thesis theses -ix -ices matrix matrices, index indices, appendix appendices The vast majority of English nouns follow the regular pattern. Thus, new nouns that enter the language usually take the regular plural. Irregular patterns are not extended to new nouns usually (vax vaxen). The strong or irregular nouns are relatively stable and show little speaker variation
visa issued by one year cannot exceed 90 days out of every 180 days. The visa is issued on the basis of an invitation to enter the Russian Federation, issued by the inviting party. The visa is issued to foreign nationals who enter the territory of the Russian Federation for the purpose of negotiations, presentations, to address specific business issues: the conclusion and renewal of contracts, commercial services, and participation in conferences, symposia, congresses and other events, bearing trade and economic nature, to improve training and retraining; drivers of vehicles carrying out regular passenger and freight services, crew members of aircraft and ships, for medical examination and treatment, adoption; lectures at colleges and professional schools, and for the time reporters and technical staff of foreign media representatives. In addition, on the basis of ordinary business visa
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