Remember that adding apostrophe followed 's' does not make a plural noun. It is used for contractions and to show possession. For example: ‘We saw lots of bird’s in the garden’ - is ...

Otherwise, if the plural noun is irregular ... With singular nouns ending in double 's', as in your examples, Jeff, I think it is more normal to add apostrophe 's' ('s) because the spelling ...

Sometimes a noun looks like it should be plural when it isn’t. Chances are that this noun is called a mass noun. Mass nouns are nouns that, by their very nature, are plural. These are also called ...