sweep的過去式是什麼

例句：

Wintry weather continues to sweep across Colorado.

寒冬氣候繼續席捲科羅拉多州。

The rescue helicopter made another sweep over the bay.

救援直升機在海灣上空又搜索了一遍。

strong winds regularly sweep the islands.

這些島嶼上經常刮大風。