Thinking aloud
Endings for talking half to yourself: exclaiming, wondering, trying to remember, and summing things up loosely.
naa
polite desu nee...huh (to oneself)
なあ ですねえ
Exclaims or muses to yourself, for envy, admiration or wishes (ii naa, samui naa, ikitai naa). Unlike ne, it isn't aimed at the listener. Polite speech has no self-talk; drawn-out desu nee is the nearest.
kyou samui naa
Man, it's cold today.
今日寒いなあ
kyou wa samui desu nee
It's really cold today, isn't it.
今日は寒いですねえ
Short na works after adjectives and -tai (samui na, ikitai na). After a dictionary-form verb, short na is a rough prohibition (iku na = don't go!), so stretch it: ame furu naa. Short na aimed at someone in place of ne (sou da na, jaa na) is masculine-leaning.
kana
polite desu ka ne / deshou kaI wonder
かな ですかね/でしょうか
Wonders aloud about something you don't know, or softens a guess or request (ii kana? = is it okay?). Because it is half to yourself, the listener can answer or not.
kaigi ashita kana
Is the meeting tomorrow, I wonder?
会議明日かな
kaigi wa ashita desu ka ne
Is the meeting tomorrow, I wonder?
会議は明日ですかね
No da before it: ashita kana, not *ashita da kana. deshou ka is the more formal polite option, right for clerks and superiors. kana is common even with coworkers as a soft hedge: ...kana to omoimasu. The feminine kashira is dated and heard mostly in dramas.
kke
polite deshita kke / -mashita kkewhat was it again?
っけ でしたっけ/〜ましたっけ
Asks someone to confirm something you once knew but have half-forgotten, like a name, time or plan. It attaches to da / datta or a past verb (nan datta kke?, itta kke?); with a non-past verb, use n da kke (iku n da kke?). It can also be nostalgic self-talk: yoku asonda kke (we used to play a lot).
kaigi ashita da kke?
Wait, is the meeting tomorrow again?
会議明日だっけ?
kaigi wa ashita deshita kke?
Sorry, remind me, is the meeting tomorrow?
会議は明日でしたっけ?
deshita kke is fine with coworkers but a little casual for superiors.
tte kanji
polite tte kanji desukind of like...
って感じ ってかんじ って感じです
Sums up a feeling or situation loosely ('it's like...'), so you can approximate when you lack the exact words. sonna kanji means 'something like that', and konna kanji desu (it's like this) is fine at work.
maa futsuu tte kanji
Eh, it's kind of just okay.
まあ普通って感じ
maa futsuu tte kanji desu
It's sort of just average.
まあ普通って感じです
A sentence-final X tte kanji is youthful and sounds vague when overused; sonna / konna kanji is the neutral all-purpose core.