1) I don't believe he is telling the truth.
我确信他没说真话
2) I did so tell the truth.
我的确说了真话。
3) I am positive that he is right.
我确信他说的对。
4) A liar is not believed when he speaks the truth.
骗子说真话，也没人相信。
5) Still he had nothing to say.
他没话可说。
6) He really doesn't say so.
他的确没这么说。
补充资料：骗子
耍弄骗术的人：骗子落入法网｜警惕政治骗子。
说明：补充资料仅用于学习参考，请勿用于其它任何用途。
参考词条