我们的任务英文

We must finish our task before the end of the year .

we must finish our mission in the December

We must finish our task by the end of the year

To develop the students' abilities is our main task.Our main task is to develop the students' abilities.It's a main task for us to develop the students' abilities.

We'll have to finish/complete our task by the end of the year.根据语境，用have to ，而不是用must。祝你开心！