when引导状语从句时,主句是一般将来时,从句是什么时态

在主句是一般将来时的前提下,时间状语从句和条件状语从句要用一般现在时,即使从逻辑上看该从句中的行为也是将来的事。例如:
I will tell him about it when I see him. I will tell him about it if I see him.
应该是一般现在时