There can be confusion over a plural possessive form. If the singular is ‘book’s title’ and the plural ‘books’ titles’, the latter can appear as ‘book’s’ or even ‘books’s’. The plural can be written with an erroneous apostrophe ‘apple’s and pear’s’, ‘doesn’t’, where the apostrophe represents the elided ‘o’, can be misspelled ‘does’nt’.