English Skills with Readings 7th Edition by John Langan

Exercise 15

Plural Forms of Irregular Nouns
The dictionary supplies the plural forms of all irregular nouns. (Regular nouns like murder form the plural by adding - s or - es ). Give the plurals of the following nouns. If two forms are shown, write down both.
analysis ________________________________________
dictionary ________________________________________
criterion ________________________________________
activity ________________________________________
thesis ________________________________________