The plural form of the possessive adjective "my" is our.
When referring to something possessed by more than one person including oneself, the correct possessive adjective to use is "our."
For example:
- "My car" (one person's car) becomes "Our car" (a car owned by a group including the speaker).
- "My house" (one person's house) becomes "Our house" (a house owned by a group including the speaker).
The possessive pronoun that corresponds to "my" is "mine," and the plural form relating to "mine" is "ours."
- "This is my book" relates to "This book is mine."
- "These are our books" relates to "These books are ours."
