Answers
1) hundredweight [many nouns have their singular and plural alike;as,sheep,swine,bread,aircraft,pair,dozen,score,thousand]
2) passers-by [compound nouns generally form their plural by adding -s to the principal word : commanders-in-chief,coats-of-mail,lookers-on,men-of-war]
3) peoples [peoples as a common noun means a nation,while people is a collective noun]
4) crises [many nouns from foreign languages keep their plural form;one needs to be careful of their singular forms:eg criterion/criteria,basis/bases,axis/axes,radius/radii]
5) experiences [some nouns have different meanings in the singular and plural form eg advice {counsel}/advices {information},air {atmosphere}/airs {affected manners}]
Note: A noun is a name given to any entity [it is derived from a Latin word nomen].A noun has three aspects which determines its usage.These aspects are number,gender and case.We would discuss these aspects in detail with our pronouns quiz.
In the usage of common nouns the only aspect tested is number i.e.the singular and plural aspect of a noun.
If advice - counsel, what about advise - ?
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