le sue vacanze estive

his/her summer vacation

→ il
phrase Rare #36,128
his/her summer vacation The possessive adjective sue agrees with vacanze, which is feminine plural. The phrase can refer to one person's summer vacation or vacations; Italian commonly uses the plural vacanze where English often uses the singular vacation.
IT: Come ha passato le sue vacanze estive?
EN: How did he/she spend his/her summer vacation?

Tom intende giocare a tennis ogni giorno durante le sue vacanze estive.

Tom plans to play tennis every day during his summer vacation.

Come ha passato le sue vacanze estive?

How did you spend your summer holidays?

Tom trascorse le sue vacanze estive a casa di sua nonna.

Tom spent his summer vacation at his grandmother’s house.

Come stanno andando le sue vacanze estive?

How is their summer vacation going?

Come sono state le sue vacanze estive?

How was your summer vacation?

Tom ha intenzione di giocare a tennis ogni giorno durante le sue vacanze estive.

Tom plans to play tennis every day during his summer vacation.