lifelong ： adjective形容词 lasting or remaining in a particular state throughout a person's life 毕生的,终生的 the two men were to remain lifelong friends. 两个人会成为终生的好友. always ： adverb副词 at all times; on all occasions 始终；总是 the sun always rises in the east. 太阳总是从东方升起. forever ： adverb副词 (亦作 for ever)for all future time; for always 永远,永久 she would love him forever. 她会永远爱他. 三个词的词性和例句如上. always和forever都是副词,要区别的话,只能看句子本身. 一般情况下,always多数用在句中,forever多数用在句末.
