教你一个检验的方法。如果always是修饰表语的，那它就与作表语的形容词和名词关系密切，不能分开。如果它是中位状语，则要放在操作词之后，实意动词之前。我把你的句子稍作改动，改为其它时态，看看always的位置是否有变化。

He has been always late for school for a year.

He has always been late for school for a year.

He has been always at home for a month.

He has always been at home for a month.

He will be always a kind person 

He will always be a kind person.

He has been always here for 3 weeks.

He has always been here for 3 months.

He will be very much like his mother.

He will very much be like his mother.

我想现在你自己都能做出判断了吧。