Irregular plural formation bacillus – locus – stimulus – genus – alga – addendum – bacterium – erratum – stratum – datum – codex – analysis – axis – basis – crisis – diagnosis – hypothesis – thesis – criterion – phenomenon – Put into the plural: 1. Can I have both …............. of the pie, please? (half) 2. A cat is said to have no less than nine …………… (life) 3. Mary slid her ………….. into her sandals. (foot) 4. It is important to brush your ………... at least twice a day. (tooth) 5. In old-fashioned speech, ………... were often denoted as the fair sex. (woman) 6. ……….. are bacteria with a long straight shape, some of which cause diseases. (bacillus) 7. They tested the children’s reaction to simple visual …………….... (stimulus) 8. Chemical experts are doing …………... of the samples. (analysis) 9. The signs and symptoms that he showed allowed several ……………... (diagnosis) 10. Not all of the present-day cultural, natural, and social …………………. have been fully understood. (phenomenon) MUCH, MANY, LITTLE, FEW