1、be: 是，

成为=become

如：She will be a teacher in two years. 两年后她会成为一名老师。

=She will become a teacher in two years

2、change into 变成；把…变成；兑换

=become, fall, get, come

如：If I roll it up, my blanket can change into a pillow.

如果我把它卷起来，我的毯子能变成一个枕头。