How to talk attendance?

I have an electronic attendance system at my school.  I want to know how to say a few sentences.

1) I need to take attendance. (It probably starts out 我要登记...)

2) So-and-so is present (Is there something more formal than 他在?)

3) So-and-so is absent (Is there something more formal than 他不在?)

Note: I have looked these up before in the nciku dictionary.  I have never been satisfied that the answers given are suitable for school-speak.

谢谢！