Nouns in the plural

The plural noun in English is tricky. There are lots of exeptions to the rules and many nouns are irregular in their plural forms. In this video you learn to spell and say some of the most common ones.
When you learn new words, it's always good to check a dictionary that give you the plural form and wether it is regular or not. A dictionary will also tell you when there are differences between British and American English, Australian or other Englishes. Don't worry if you get them wrong when you are speaking; most people will understand anyway, but make sure that you get them right when you're writing!
Below you find a list of nouns that change most in their plural form.
alumnus alumni
analysis analyses
aquarium aquaria
bacterium bacteria
child children
crisis crises
curriculum curricula
emphasis emphases
foot feet
fungus fungi
hippopotamus hippopotami
index indexes
man men
memorandum memoranda
mouse mice
neurosis neuroses
nucleus nuclei
oasis oases
octopus octopi
person people
plateau plateaux
runner-up runners-up
son-in-law sons-in-law
syllabus syllabi
thesis theses
tooth teeth
woman women