英语口语中如何表达"很肯定" "很确定"

1. Absolutely!/ Definitely!
 
那当然！
2. It's certain.
那是一定的。
3. It's for sure! / Sure thing!
那是一定的！
4. You bet! / You betcha! / You bet your life!
我可以打包票！
5. No doubt! / There's no doubt about it!
毫无疑问！ 
6. It's in the bag.
已经是囊中之物了。（十拿九稳、跑不掉的。）
7. It's settled. / It's set in stone.
已经定案了。
8. It's a done deal. / It's a dead cert!
已经定案了。
9. Sorted!
搞定！（英式俚语）