The comedian skillfully imitated the president's voice and mannerisms.

imitated 是动词 imitate 的过去式。imitate 由词根 imit（来自拉丁语 imitari，意为"模仿"）和后缀 -ate（表示动词）组成，意思是"模仿、效仿"。在句中指喜剧演员对总统声音和举止的模仿行为。