我敢发誓这事是他干的。
I'll take my dick he did it.
http://www.iciba.com/search?s=%E8%82%AF%E5%AE%9A
一定
by all means ,all to nothing ,by the holy poker, to a certainty
必然
bet your boots, cannot but ,necessity
确定
confirm, ensure ,fix on ,make certain ,make sure ,ascertain
肯定
affirm, affirmation
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