The plural form is Ps and Qs.
The plural possessive form is Ps and Qs'.
Example: Your Ps and Qs' training seems lacking.
No. Plural possessive is "their" Possessive pronouns do not use an apostrophe.
The plural is lads. The plural possessive is lads'.
The plural is relatives. The plural possessive is relatives'.
The plural possessive is weeks'.
The plural possessive is pals'.
Coaster's is singular possessive. The plural is coasters, the plural possessive is coasters'.
No. Plural possessive is "their" Possessive pronouns do not use an apostrophe.
The plural is briefs. The plural possessive is briefs'.
The plural is lads. The plural possessive is lads'.
The plural is trollies. The plural possessive is trollies'.
The plural is relatives. The plural possessive is relatives'.
The plural is stations. The plural possessive is stations'.
Museum is singular. Museum's is singular possessive. Museums is plural. Museums' is plural possessive.
The singular possessive form is heart's; the plural possessive form is hearts'.
The plural of rose is roses. The plural possessive is roses'.
The plural form is homes; the plural possessive is homes'.
The singular possessive is biker's; the plural possessive is bikers'.