隨句子的結(jié)構(gòu)判斷.
如：You can never smoke here.（句中有情態(tài)動(dòng)詞,故后加動(dòng)詞原型）
What you need to know is never to commit crime.（動(dòng)詞不定時(shí),never to do=not to do)
He never reads this kind of book.（never作為頻度副詞,動(dòng)詞隨主語(yǔ)人稱）