begun

v.开始;启动;起始;开始存在(或进行);起初是;本来是

begin的过去分词

例句：

The window frames had begun to warp.

窗框已经开始变形。

He had begun to feel sleepy.

他已觉得困了。

相关介绍

She has begun to make a concerted effort to find a job.

她开始尽全力寻找工作。

The UN has begun making airdrops of food to refugees.

联合国已开始向难民空投食物。

Work has begun on the construction of the new airport.

新机场的修建已经开工。