Experts please answer...

Dear Student.

a) We will have finished the sightseeing by the time it gets dark.
b) Next January, she will have completed three years in this school.
c) Mother will have returned from her tour next weekend.
d) Jaya will have swam for an hour before the sun rises.
e) We will have reached the foothills tomorrow. 

We hope that this answer solves your query.
Regards.