The plural of sister is sisters
The plural possessive form of sister is sisters'
There isn't one, "sis" is a slang/informal short form for "sister". It's not a real word. So, you can make one up if you like.
Stepsisters is the plural form.
The plural is ecstasies. (would have to be different forms or times, because ecstasy is an emotional feeling)
In English, there is no distinction between masculine, feminine and neuter. Verb forms are not determined by gender, verb forms are universal. Gender is shown by different forms or different words,The noun purple is a neutral noun; the plural form is purples.
The noun 'sister' is not plural and is not possessive.The plural form is sisters.The possessive form is sister's.The plural possessive form is sisters'.
The word sisters' is plural possessive. The singular is sister, singular possessive is sister's; the plural is sisters, the plural possessive is sisters'.
Singular. Plural is: they are, have and do.
The plural form of "sister" is "sisters."
The plural form for the noun mouse is mice.The plural form mice is an irregular plural, a noun that forms the plural in a different way than adding an -s or an -es to the end of the word.
The plural form of sister is sisters.
The plural is ecstasies. (would have to be different forms or times, because ecstasy is an emotional feeling)
The plural form for the noun sister is sisters.
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).
In English, there is no distinction between masculine, feminine and neuter. Verb forms are not determined by gender, verb forms are universal. Gender is shown by different forms or different words,The noun purple is a neutral noun; the plural form is purples.
A sister is "une soeur" in French. The plural is "des soeurs".
The word sisters' is plural possessive. The singular is sister, singular possessive is sister's; the plural is sisters, the plural possessive is sisters'.
The noun 'sister' is not plural and is not possessive.The plural form is sisters.The possessive form is sister's.The plural possessive form is sisters'.
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'.
Words have plural forms, but sentences don't. It doesn't really mean anything to say, what is the plural form of that sentence. However, the sentence does contain two nouns, sister and cousin, which could be changed to plural nouns, sisters and cousins. It is not necessary to change college, since "in college" does not necessarily mean in a specific college, just in some college.