1
swear to do sth
接不定式表示承诺做某事。
He swore to tell the truth.
他发誓要说实话。
发誓
sworn — past participle of swear · irregular form
先理解核心含义，再看它在真实句子里的用法。
发誓
to promise solemnly; take an oath
He swore to tell the truth.
他发誓要说实话。
常指在法庭或正式场合宣誓
宣誓,郑重承诺,并具有法律约束力。
To take an oath, to promise intensely, solemnly, and/or with legally binding effect.
宣誓某一断言为真。
To take an oath that an assertion is true.
强烈承诺某事为真；强烈断言。
To promise intensely that something is true; to strongly assert.
对某人进行宣誓。
To administer an oath to (a person).
swear
Base
原形
swears
3rd person
第三人称单数
swearing
-ing
现在分词
swore
Past
过去式
sworn
Past participle
过去分词
He swears he didn't do it.
他发誓他没做。
She swore at the driver.
她咒骂了那个司机。
不规则动词，过去式swore，过去分词sworn
In court, the witness swore to tell the truth, the whole truth, and nothing but the truth.
在法庭上，证人发誓说实话，全部事实，绝无谎言。
The driver swore at the cyclist who cut him off.
司机对着突然插到他前面的骑自行车的人咒骂。
He swore an oath to defend his country.
他发誓要保卫国家。
接不定式表示承诺做某事。
He swore to tell the truth.
他发誓要说实话。
接that从句表示发誓声称某事。
She swore that she had never seen him before.
她发誓她从未见过他。
表示用粗话辱骂某人或某物。
The driver swore at the cyclist.
司机咒骂了那个骑自行车的人。
Not this
He swore to me when I stepped on his foot.
Use this
He swore at me when I stepped on his foot.
表示“咒骂”时，应使用介词 at，而不是 to。swear to 意为“向…保证”，与咒骂意思不同。
Not this
I swear going to study hard.
Use this
I swear to study hard.
swear 后接不定式（to do）表示发誓要做某事，不能直接接动名词（doing）。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
宣誓
He swore an oath to tell the truth.
他宣誓要说出真相。
宣誓效忠
The soldiers swore allegiance to their country.
士兵们宣誓效忠他们的祖国。
咒骂
She swore at the driver who cut her off.
她咒骂那个突然插到她前面的司机。
以…发誓；深信
Many people swear by this remedy for colds.
很多人深信这种感冒药有效。
使宣誓就职
The president was sworn in last week.
总统上周宣誓就职。
宣誓后作证
He testified under oath that he had seen the accident.
他宣誓后作证说他目睹了事故。
极其信赖；常用……并相信其效果
I swear by this brand of toothpaste; it's the best.
我非常信赖这个牌子的牙膏，它是最好的。
使宣誓就职
The president will be sworn in next week.
总统将于下周宣誓就职。
发誓戒除
He swore off smoking after the health scare.
在健康警示之后，他发誓戒烟。
我发誓，以月亮和天上的星星为证，我会在那里。
This is the chorus of the 1993 hit song 'I Swear' by All-4-One, often used in weddings to express a solemn promise.
这是1993年All-4-One的热门歌曲《I Swear》的副歌，常在婚礼中用来表达庄严的承诺。
我以旧神和新神之名起誓。
This oath is frequently used in the TV series 'Game of Thrones' to make a solemn vow, invoking both ancient and new deities.
这是电视剧《权力的游戏》中常用的誓言，以新旧诸神的名义做出庄严承诺。
Use sworn naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
联想'swear'音似'撕耳'，发誓时撕耳以示郑重，若违背誓约则遭诅咒。
register: mixed; contexts: 法庭宣誓, 咒骂; note_zh: 该词根据上下文，既可用于正式场合的宣誓，也可用于日常咒骂，语域差异大。通常，swear an oath用于正式场合，swear at someone用于非正式甚至粗鲁场合。
及物时接宾语或that从句；不及物时常用swear at sb/sth（咒骂）或swear by sth（以…发誓）
Dictionary facts from ECDICT, WIKTIONARY.