1. when (used in questions about time)
2. when (during which)

third-person singular present indicative of ser

1. Third-person singular possessive pronoun. his; her; its
2. Third-person plural possessive pronoun. their; theirs
3. Second-person singular possessive pronoun. your; yours (when using the second-person pronoun você)
4. Second-person plural possessive pronoun. your; yours (when using the second-person pronoun vocês)
5. you (used before epithets for emphasis)

anniversary, birthday