[quote=rickair7777;473813]A CFII is the PIC (usually) and can log conditions of flight, including IMC. He can't log approaches or landings, and probably should not log holds and intercepting/tracking either...especially if he needs it for currency.
However only the pilot flying should log those task which require sole manipulation of controls: Landings and approaches.quote]
A Flight Instructor can log instruemnt approaches with a student but only if the approaches are in IMC. The Flight Instructor can log PIC while giving instruction in simulated conditions becasue he is a required crew member. He or she can always log PIC, landings, and conditions while giving duel.