By the time you meet him he will have done
By the time the lessons are over the pupils will have run out of the classroom
Before the bell rings the children will have prepared everything for the lesson
When my letter reaches you i will have moved to New York
Before I hear for my sister again I will have made many inquiries about her
Before supper my father will have looked through evening papers
By the time we get there the sun will have set
Before you learn to speak English fluently you will have done many exercises
Bh the time you get your pay she will have spent all the money