（8）表示肯定Stating Certainty
Ibet！
我敢打赌！
You bet！
当然啦！
Absolutely！
绝对！
No kidding！
不开玩笑！
Definitely！
没错！
Yes，really！
确实是真的！
You bet it is.
一定是这样。
Believe it or not.
信不信由你。
I'm sure about that.
此事我能确信。
That's beyond doubt.(https://www.daowen.com)
毋庸置疑。
It can't be otherwise.
非此莫属。
I've no doubt about it.
此事我毫无疑问。
Igive youmy word for it.
我向你保证。
You havemy word for it.
我向你保证。
I'm a hundred percent sure.
我百分之百肯定。
There's no doubt/question about it.
这是毫无疑问的。
There's no room for doubt about it.
此事无可怀疑。
I'm absolutely positive about it.
此事我完全可以肯定。
There shouldn't be any doubt about it.
那是毫无疑问的。