Future perfect tense with the verbs given:
1.) Sarah WILL HAVE BUILT a sand castle in the sand box.
2.) Antonio WILL HAVE HIDDEN behind the slide.
3.) Mika WILL HAVE SMILED before the snacks.
4.) Hannah WILL HAVE WORN her sunflower patterned dress.
5.) Haku and Sana WILL HAVE MADE the best memories in this playground.
Hope it gives you an idea :)
