Question

Tense correction.They _____(finish) the work before you come.

Answer 1

The correct tense to be used in the blank is Past Perfect.

They had finished the work before you come.

Explanation

Past Perfect Tense is used to refer to an action that happened before another action in the past. In this sentence 'they' ‘had finished’ the work before 'you' came’. There were two actions. Finishing the work happened first; coming of 'you' happened after the finishing. So, we used the past perfect.  

Answer 2

Answer:

They will have finished the work before you come.