He has never been to America .
他从没到过美国。
She is always/never late for school.
她上学总是/从来不迟到。
I often go to school by bus .
我经常乘公共汽车上学。
Jim sometimes goes to school on foot .
吉姆有时步行上学。
分析:never "从来不“, always "总是”,often "经常“,sometimes "有时”都是频率副词,一般放在动词be,情态动词和助动词之后,实义动词之前。 常与一般现在时连用,never 也可用于完成时。