CH3F MO Diagram: Step-by-Step Guide for Drawing a Molecular Orbital Diagram

[TomBurgundy]

Homework Statement

I was wondering if anyone could help me out on how to draw a molecular orbital diagram for the tetrahedral CH3F. I understand how to draw a molecular orbital diagram for the more simple molecule CH4, but am unsure as to how I can incorporate the p orbitals of the fluorine atom into the diagram?
Any help or hints would be greatly appreciated.

Thanks

 

[Borek]

Are they involved?

 

[DrDu]

Are they involved?

Probably. At least one of them is responsible for bonding.