never后是接动词原形还是该用什么就用什么

随句子的结构判断.
如：You can never smoke here.（句中有情态动词,故后加动词原型）
What you need to know is never to commit crime.（动词不定时,never to do=not to do)
He never reads this kind of book.（never作为频度副词,动词随主语人称）