1. かい: full gentler variant of question particle か (ka), used by some men.

According to my sources that seems incorrect. kai is not gentler. It is infact indicating that a posisive response is required, when a superior speaks to a subordinate (for example). Wakarukai would mean something like "You get it, don't you?". This was according to my Japanese friends. Does anyone have anything coming out of a grammar book? :)

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