The adverb "naka-naka" can be used to comment on a surprising result, just don't use it when discussing the results your boss gets.
The verb "sugiru," which means to exceed, can be used in a variety of ways both positive and negative.
The "ka dōka" structure helps to explain that there's a choice between one option or the other and is quite convenient in conversational Japanese.
While "darake" and "mamire" both have different nuances, the one thing they have in common is that they always refer to something bad.
"Narubeku" conveys the idea of "as … as possible," while "deikru dake" conveys the same idea with stronger intent.
The term "rashii" is used when you've heard about something and want to talk about it without using assertions.
The "sō da" structure can help convey hearsay and conjecture in Japanese.
The "gatera" structure is often used in formal situations and points out that you will do one action because you're already doing another.
A good way to express surprise is to use the common Japanese term, "itsu no ma ni ka."
You'll hear the word "tame" pop up a lot in Japanese conversation. Pay attention to the verb that comes before it.