用于习语 become of, 表示“发生”、“遭遇”等 (常与 what连用)。
例句：
It soon became apparent that no one was going to come.
很快就很清楚，没人会来。
One of the panels had become detached from the main structure.
一块镶板已从主体结构上脱落。
With technological changes many traditional skills have become obsolete.
随着技术的革新，许多传统技艺已被淘汰。
Patients can become conditioned to particular forms of treatment.
病人会习惯某些治疗方式。
The new speed limit on this road becomes effective from 1 June.
这条路上新的限速规定自6月1日起生效。