发誓1、swear

v.发誓;咒骂

n.咒骂;发誓，宣誓

例：If you swear to do something, you promise in a serious way that you will do it.

发誓2：vow

n.誓言;郑重宣布

vt.& vi.起誓，发誓;郑重宣告

例：A vow is a serious promise or decision to do a particular thing.

发誓3：pledge

n.保证，誓言;[法]抵押权;公约;（表示友谊的）干杯

vt.& vi.使发誓，保证;典当，抵押

vt.许诺;用…担保;以誓言约束;向…祝酒

vi.作出庄重有约束力的誓言;祝愿，祝酒

例：When someone pledges to do something, they promise in a serious way to do it. When they pledge something, they promise to give it.

发誓4：take an oath

v.赌咒发誓;明誓;宣誓，发誓，立誓;设誓起愿

例：I will take an oath that he said so. 

以上发誓英语的4种表达方法，大家可有get到？送大家一句话，可别千万轻易发誓哦，发过的誓，一定要完成哦。