日积月累学口语:"确定一定以及肯定"这么表达才地道

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Absolutely!/ Definitely!
那当然！

It's certain.
那是一定的。

It's for sure! / Sure thing!
那是一定的！

You bet! / You betcha! / You bet your life!
我可以打包票！

No doubt! / There's no doubt about it!
毫无疑问！

It's in the bag.
已经是囊中之物了。（十拿九稳、跑不掉的。）

It's settled. / It's set in stone.
已经定案了。

It's a done deal. / It's a dead cert!
已经定案了。

Sorted!
搞定！（英式俚语）