always应该是行为动词之前,be动词和情态动词,还有助动词之后.
比如：I will always remember you.
I do always read testbook.
I am always your close friend.
还有至于什么叫系动词,我觉得你只要知道be后面接形容词就是做系动词,接that引导的从句就是表语从句.