Our task is to finish the job in three weeks.为什么用to finish?

Our task is to finish the job in three weeks.为什么用to finish? to finish this task in three days is ( ) an easy job. To finish the job is () .You must () . What I should do is to finish the task soon,为什么要加to , I found_____impossible to finish the task in two days To be honest, it is a s___to finish the task 10.Do you think the task is -------- difficult to finish? two weeks (is not) enough for us to finish this task.we need as far as i ()it is possible to finish the task in such a sh 4.It is impossible to finish the task ____.A.in such sort a I think two___is enough to finish the task.a.weeks time b.we Well have to finish the task,_______.