helicopter的復數形式是直接在單詞后加s，第三人稱(chēng)單數形式是helicopters，過(guò)去式形式是helicoptered，過(guò)去分詞形式helicoptered，現在分詞形式helicoptering。

　　例句：

　　1、The helicopter made several passes over the village before landing.

　　直升機在村落上空盤(pán)旋數次才降落。

　　2、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。

　　3、The helicopters appeared as two black dots on the horizon.

　　直升機像兩個(gè)小黑點(diǎn)出現在地平線(xiàn)上。

　　4、Stay well away from the helicopter when its blades start to rotate.

　　直升機的螺旋槳開(kāi)始轉動(dòng)時(shí)，盡量離遠點(diǎn)兒。

　　5、A helicopter was scrambled to help rescue three young climbers.

　　直升機接到命令，緊急起飛前去營(yíng)救三個(gè)登山的年輕人。