catapult的现在完成时怎么写？

The boy surrendered the catapult to the teacher.那孩子把弹弓交给了老师.He fitted a pebble into the catapult and pulled back the elastic. Twang!他把石子放进弹弓里，然后往回拉动橡皮筋。“嘣”！The sting of the catapult bullet had worn off.挨的那下弹弓不那么疼啦....

n.弹弓，石弩，飞机弹射器，弹射座椅vt.用弩炮发射，用弹弓射，用弹射器发射，猛投vi.用弹射器弹射，快速移动...

catapult的一般过去时为：catapulted...

catapult的第三人称单数（三单）为：catapults...

catapult的复数形式为：catapults...

catapult的音标：catapult的英式发音音标为：['kætəpʌlt]catapult的美式发音音标为：['kætəˌpʌlt,-ˌpʊlt]...

catapult的现在进行时为：catapulting...