用于習語 become of, 表示“發生”、“遭遇”等 (常與 what連用)。
例句：
It soon became apparent that no one was going to come.
很快就很清楚，沒人會來。
One of the panels had become detached from the main structure.
一塊鑲板已從主體結構上脫落。
With technological changes many traditional skills have become obsolete.
隨著技術的革新，許多傳統技藝已被淘汰。
Patients can become conditioned to particular forms of treatment.
病人會習慣某些治療方式。
The new speed limit on this road becomes effective from 1 June.
這條路上新的限速規定自6月1日起生效。