The plural form of the noun is focuses or foci. Either is acceptable.
Genus has the plural genera.
Foci is the plural form of the singular noun focus.
The plural forms thesauruses and thesauri are both acceptable forms of the word thesaurus.
Here are some irregular verbs with their present/pastform. All can be used with plural subjects.cut / cutbite / bitrun / ranspit / spatsteal / stolebe verbs have plural forms they are:present plural = are past plural = was / wereAlso have is plural and singular form is has
Plural possessive forms are used to show that more than one person or thing owns or is associated with something. For regular plural nouns, you add an apostrophe after the s (e.g., students' books). For irregular plural nouns that do not end in s, you add 's (e.g., children's toys).
Genus has the plural genera.
It forms the plural of many nouns.
Foci is the plural form of the singular noun focus.
There are two accepted forms of the noun: adviser and advisor.The plural forms are advisers and advisors.The plural possessive forms are advisers' and advisors'.
The plural of stop is stops. For example: There were many stops and changes of pace. However, if stop is used as a verb, then there is no plural. Only nouns can have plural forms.
The plural form for the noun focus is focuses.Example: His subjects are good but his focuses are always off.
Verbs don't have plural forms.
plural forms are uteri or uteruses.
There are two accepted plural forms of the noun vertex: vertices and vertexes.The plural possessive forms are vertices' and vertexes'.
Correct forms: one boss, many bosses.
The plural forms thesauruses and thesauri are both acceptable forms of the word thesaurus.
The plural forms for the singular lumen is lumina or lumens, both are accepted plural forms.