can be done was done could be done must have been done will be done have been done

1.Everything can be done if you set your mind to do it .
2.The mission was done already.
3.He told me an amazing story yesterday that how the mysterious mission could be done and that's the very part that i really wanted to know.
4.Nowthat he is here,his job must have been done.
5.We still have time,take it easy,the job will be done in 30minutes.
6.If i got there earlier,our task should have been done already.