when引导的状语从句,主句和从句是什么时态

问题描述:

when引导的状语从句,主句和从句是什么时态

亲:主句是将来时,从句是一般现在时.
When I am free,I will go there.
主句是过去进行时,从句是一般过去时.
WHen I came in,he was doing his work.就只有两种吗