1. a) Nouns with foreign plurals only:
1. analysis [əˈnælɪsɪs] — analyses [əˈnæləsi:z] — анализ(ы)
2. criterion [kraɪˈtɪərɪən] criteria [kraɪˈtɪərɪə] — критерий(и)
3. phenomenon [fɪˈnɒmɪnən] — phenomena [fɪˈnɒmɪnə] — явление(я)
4. datum [ˈdeɪtəm] — data [ˈdeɪtə] — данное(ые)
5. stratum [ˈstrɑːtəm] — strata [ˈstrɑ:tə] — слой(и)
1. b) Nouns with both foreign and regular plurals.
6. cactus — cacti [ˈkæktaɪ] или cactuses [ˈkæktəsɪz] — кактус(ы)
7. genius — genii [ˈʤi:nɪaɪ] или geniuses [ˈʤiːnjəsɪz] — гений(и)
8. antenna — antennae [ænˈtɛni:] или antennas [ænˈtɛnəz] — антенна(ы)
9. formula — formulae [ˈfɔːmjʊli:] или formulas [ˈfɔ:mjʊləz] — формула(ы)
10. index — indices [ˈɪndɪsi:z] или indexes [ˈɪndɛksɪz] — индекс(ы)
11. appendix — appendices [əˈpɛndɪsi:z] или appenixes [əˈpɛndɪksɪz] — аппендикс (приложение)
12. medium — media [ˈmi:dɪə] или mediums [ˈmi:djəmz] — средство(а)
13. Memorandum — memoranda [ˌmeməˈrændə] или memorandums [ˌmɛməˈrændəmz] — меморандум(ы)
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Предложения:
1. Cacti are plants which can live in hot, dry placess.
2. Such phenomena are rather rare in life.
3. I have never been good at maths formulas.
4. There are three appendices at the end of the book.
5. What criteria do you use in your work?