turn 和become在意为“变成”时，他们的区别是什么，谢谢

become 它是一个中性词,用于意义好、坏两方面的变化都可以.可与形容词和名词连用.

What do you have to do to become a pilot?人们需要做些什么才能成为飞行员?

Richard became aware of the gravity of the situation.理查德开始意识到情况的严重性.

(1)通常不用become来谈论有目的的行动.Please get ready now.现在请作好准备.(不能说：Please become ready now.) (2)表示将来之事的"成为…",在口语中常用be来表示.He wants to become a doctor.＝He wants to be a doctor.(3)"演变到,终于……"不用become而用come to do来表示.She has come to like rock music.她终于喜欢摇滚乐了.

.turn 大多用于看得见的或人人注目的状态上的变化.常用在表示颜色的词之前(在文体上比go较为正式).She turned bright red and ran out of the room.她的脸一红,就跑出了屋子.