just作“刚刚”解时,常和现在完成时连用,一般位于助动词之前,行为动词之后。如:
I have just finished lunch.我刚吃过午饭。
just now作“刚才”、“一会儿之前”解时,常与一般过去时连用,位于句首或句末;它也可指“(加重语气的)现在”或“片刻之后”,这时可用于现在时或将来时。如:
They gave it to me just now.他们刚才把它给了我。
I'm busy just now.我现在很忙。
I'll tell you a story just now if you have time to listen to it.
如果你有时间,我马上就把故事讲给你听。
just then意为“就在那时”,just此时用来加重then的语气。如:
Just then the teacher came in.就在那时,老师走了进来。