Courtesies.
The plural form of courtesy is courtesies
That is the correct spelling of "courtesy" (politeness, or a complementary service).The similar word is curtsy (formal bow by a girl or woman).
The word for polite actions (plural of courtesy) is courtesies.
The plural form for the demonstrative pronoun this is these.
The plural form of the word inferno is infernos.
The plural form is ranches.
There is no plural word for if.
There is no plural form for the word, countries. This word itself is a plural.
The plural form is data.
The plural form for the word 'pioneer' is pioneers.
The plural form of the word "baby" is "babies."
The plural form of the word "pharynx" is "pharynges."