become用在现在完成时用什么代替

用has become代替，例如：

1、May Day has become a venerable institution.五朔节已经变成一个神圣庄严的传统节日。

2、The environment has become a very hot issue.环境已成为很热门的话题。

3、The Internet has become part of everyday life.互联网已成为日常生活的一部分。