过去式：swore；过去分词：sworn。例句：They swore their allegiance to the USA and received their naturalization papers.他们起誓忠诚于美国，随后就接到了批准他们入籍的文件。
swear的用法
swear的用法1：swear的基本意思是“咒骂”,指用污秽的语言对某人或某物进行攻击,造成精神上的伤害。swear还可指明确或郑重地向某人保证某事,即“发誓”。
swear的用法2：swear可用作及物动词,也可用作不及物动词。用作及物动词时,后接名词、代词、动词不定式或that从句作宾语,还可接以形容词充当补足语的复合宾语。可用于被动结构。
swear的用法3：swear表示“骂人”时,其后须与介词at连用。
swear的用法4：swear的过去式是swore,过去分词是sworn。
相关例句
1.He swore in Spanish, another indication that he was rattled.
他用西班牙语破口大骂，这再次表明了他极为烦躁。
2.Kelly swore quietly, looking at the deep cut on his left hand.
凯利看着自己左手上深深的伤口，嘴里暗骂了一句。
3.We both swore we&39;d be friends ever after.
我俩都发誓从此以后永远是朋友。
