- A: I just saw a cockroach.
B: Kill it!
A: I can't. I've taken a vow not to kill bugs again.
- A: Are you sure what you said is true?
B: Yes. I swear it's true.
- I've taken a vow of silence for the day because I lost my voice this weekend.
- A: What's his secret?
B: I can't tell you. I've sworn not to tell anyone.
 take a vow swear
take a vow to do something = swear to do something = 發誓要做某事或不做某事swear = 發誓宣稱說某事情是真的或是假的也就是說，swear 可以用在更多地方。
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