swear to sb

對某人發誓

1，I swear to you , I have never told Lily about you and me.
我向你發誓，我從未告訴過莉莉關于你和我的事。

2. Swear to me, you will never ever cheat on me.
   我要你向我發誓你永遠不會欺騙我。

3.He has ever sworn to Lily he will love her for ever. but now , he has an affair with Emma.
他曾向莉莉發誓，他將永遠愛她。但現在，他和艾瑪有曖昧關系

swear to do sth

發誓做某事

1.I swear to love you for ever.
我發誓永遠愛你。

2.I swear not to tell Lily anything.
我發誓不告訴莉莉任何事。

3.I swear to take revenge on you and your family.
我發誓要報復你和你的家人

swear by

以…的名義起誓

1.I swear by God, I love you for ever.
我以上帝的名義發誓，我永遠愛你。

2. I swear by the moon, all of what I have said is truth.
   我以月亮的名義發誓，我所說的一切都是真的。

3。I swear by myself , I have not any affair with Emma.
我以我自己的名義發誓，我和艾瑪沒有任何關系。

swear on

以...發誓，對著...發誓

1.I swear on a stack of Bibles，stinky tofu is the most delicious food in the world.
我對著一堆圣經發誓，臭豆腐是世界上最美味的食物。

2.I swear on my life , I 'm not cheat on you.
我以我的生命發誓，我不騙你。

3.I swear on all I hold deal ， I will never betray you.
我以身家性命發誓，我永遠不會背叛你。