我已经告诉过你，不及物动词为主动还是被动意义，不是根据汉语判断，而是根据英语动词的本来意义判断，即英英词典是如何解释这个动词的。你应该做的是查词典，而不是在这里提问：我替你查了下面几个词。

My English has improved.  

improve: [no object] : to become better 主动意义

It tastes good. 

taste: [linking verb] : to have a particular taste 主动意义

My dream has come true.

come true: to become real : to happen in the way that you wished or dreamed 主动意义

The books sell well.

 sell: [no object] : to be bought by someone or by many people 被动意义

The leaves has fallen.

fall: to come or go down quickly from a high place or position 主动意义